{"id":47089,"date":"2023-11-20T16:43:17","date_gmt":"2023-11-20T07:43:17","guid":{"rendered":"https:\/\/kinsta.com\/jp\/?p=47089&post_type=knowledgebase&preview_id=47089"},"modified":"2025-10-02T04:45:43","modified_gmt":"2025-10-01T19:45:43","slug":"react-useref","status":"publish","type":"post","link":"https:\/\/kinsta.com\/jp\/blog\/react-useref\/","title":{"rendered":"React\u306euseRef\u30d5\u30c3\u30af\u306e\u57fa\u672c\u7684\u306a\u5f79\u5272\u3092\u7406\u89e3\u3059\u308b"},"content":{"rendered":"

React<\/a>\u306b\u304a\u3044\u3066\u30d5\u30c3\u30af\u3068\u306f\u3001\u958b\u767a\u8005<\/a>\u304c\u30af\u30e9\u30b9\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u5fc5\u8981\u3068\u305b\u305a\u306bReact\u306estate\u3084\u305d\u306e\u4ed6\u306e\u6a5f\u80fd\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u7279\u5225\u306a\u6a5f\u80fd\u3067\u3059\u3002\u30d5\u30c3\u30af\u306e\u4e2d\u3067\u3082useRef<\/code>\u30d5\u30c3\u30af\u306f\u3001\u5024\u3092\u7ba1\u7406\u3057\u305f\u308a\u3001DOM\uff08Document Object Model\uff09\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306e\u8cb4\u91cd\u306a\u6a5f\u80fd\u3068\u3057\u3066\u969b\u7acb\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

useRef<\/code>\u30d5\u30c3\u30af\u306f\u8a08\u308a\u77e5\u308c\u306a\u3044\u67d4\u8edf\u6027\u3068\u53ef\u80fd\u6027\u3092\u3082\u305f\u3089\u3059\u5f37\u529b\u306a\u3082\u306e\u3067\u3059\u304c\u3001\u591a\u304f\u306e\u958b\u767a\u8005\u304c\u3053\u308c\u306e\u4f7f\u3044\u65b9\u3092\u8aa4\u89e3\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001useRef<\/code>\u30d5\u30c3\u30af\u3092\u6df1\u6398\u308a\u3057\u3001\u305d\u306e\u76ee\u7684\u3001\u6a5f\u80fd\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u660e\u3089\u304b\u306b\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u307f\u7d42\u3048\u308b\u9803\u306b\u306f\u3001\u30d5\u30c3\u30af\u306e\u672c\u8cea\u3092\u7406\u89e3\u3057\u3001\u305d\u306e\u53ef\u80fd\u6027\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u6d1e\u5bdf\u3092\u7372\u5f97\u3067\u304d\u3066\u3044\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n

useRef\u30d5\u30c3\u30af\u3068\u306f<\/h2>\n

useRef<\/code>\u30d5\u30c3\u30af\u306e\u4e3b\u306a\u76ee\u7684\u306f\u3001\u66f4\u65b0\u3055\u308c\u3066\u3082\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u767a\u751f\u3057\u306a\u3044\u3088\u3046\u306a\uff08\u5909\u66f4\u53ef\u80fd\u306a\uff09\u5024\u3092\u4fdd\u5b58\u3059\u308b\u3053\u3068\u3068\u3001DOM\u8981\u7d20\u3078\u306e\u53c2\u7167\u3092\u4fdd\u5b58\u3059\u308b\u3053\u3068\u306e2\u3064\u3067\u3059\u3002\u3053\u306e\u30d5\u30c3\u30af\u304c\u3069\u306e\u3088\u3046\u306b\u52d5\u4f5c\u3059\u308b\u306e\u304b\u3001\u3082\u3046\u5c11\u3057\u8a73\u3057\u304f\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n

React<\/a>\u3067\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u72b6\u614b\uff08state\uff09\u3084\u305d\u306e\u4ed6\u306e\u5909\u6570\u306f\u901a\u5e38\u30ea\u30bb\u30c3\u30c8\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u3066\u3082\u7279\u5b9a\u306e\u5024\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u3001useRef<\/code>\u30d5\u30c3\u30af\u304c\u6d3b\u8e8d\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u9593\u3067\u6c38\u7d9a\u3059\u308b\u304b\u305f\u3061\u3067\u5024\u3092\u53c2\u7167\u3057\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4ed6\u306e\u90e8\u5206\u304c\u5909\u66f4\u3055\u308c\u3066\u3082\u5024\u304c\u305d\u306e\u307e\u307e\u6b8b\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u3055\u3089\u306b\u3001useRef<\/code>\u30d5\u30c3\u30af\u306f\u3001DOM\u8981\u7d20\u306e\u64cd\u4f5c\u306b\u3082\u6709\u7528\u3067\u3059\u3002React\u3067\u306f\u3001DOM\u8981\u7d20\u306b\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3057\u305f\u308a\u5909\u66f4\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u306f\u3001\u7279\u306buseRef<\/code>\u30d5\u30c3\u30af\u306a\u3057\u3067\u306f\u56f0\u96e3\u3067\u3059\u3002useRef<\/code>\u3092\u4f7f\u3048\u3070\u3001\u7279\u5b9a\u306eDOM\u8981\u7d20\u3078\u306e\u53c2\u7167\u3092\u53d6\u5f97\u3057\u3001\u305d\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066\u64cd\u4f5c\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea<\/a>\u3084\u8907\u96d1\u306a\u56de\u907f\u7b56\u304c\u4e0d\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

React\u3067useRef\u3092\u5b9f\u88c5\u3059\u308b<\/h2>\n

React\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u3044\u59cb\u3081\u308b\u306b\u306f\u3001React\u30d1\u30c3\u30b1\u30fc\u30b8\u304b\u3089\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n

import { useRef } from 'react';<\/code><\/pre>\n
\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u305f\u3089\u3001useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3001\u95a2\u6570\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067ref\u5909\u6570\u3092\u5ba3\u8a00\u3057\u307e\u3059\u3002<\/p>\n
const myRef = useRef();<\/code><\/pre>\n
\u3053\u308c\u3067\u3001myRef\u3068\u3044\u3046ref\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u3001\u5024\u306e\u683c\u7d0d\u3084\u30a2\u30af\u30bb\u30b9\u306b\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3069\u306e\u8981\u7d20\u3067\u3082myRef<\/code>\u5909\u6570\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u305d\u306e\u8981\u7d20\u306eref<\/code> prop\u306b\u4ee3\u5165\u3057\u307e\u3059\u3002<\/p>\n
<div ref={myRef}>\u3053\u308c\u306f\u8981\u7d20\u306e\u4f8b\u3067\u3059<\/div><\/code><\/pre>\n
\u4e0a\u306e\u4f8b\u3067\u306f\u3001div<\/code>\u8981\u7d20\u306bref<\/code> prop\u3092\u4ee3\u5165\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u306e\u4ed6\u306e\u5834\u6240\u3067myRef<\/code>\u5909\u6570\u3092\u4f7f\u7528\u3057\u3066\u8981\u7d20\u3092\u53c2\u7167\u3057\u3001\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u53c2\u7167\u306b\u683c\u7d0d\u3055\u308c\u305f\u5024\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f\u3001myRef<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e.current<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
const myRefValue = myRef.current;\nconsole.log(myRefValue); \/\/ <div>\u3053\u308c\u306f\u30b5\u30f3\u30d7\u30eb\u306ediv\u3067\u3059<\/div><\/code><\/pre>\n
useRef\u30d5\u30c3\u30af\u306b\u3088\u308bDOM\u64cd\u4f5c<\/h2>\n
DOM\u306e\u64cd\u4f5c\u306f\u30a6\u30a7\u30d6\u958b\u767a\u3067\u306f\u4e00\u822c\u7684\u306a\u64cd\u4f5c\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306e\u5185\u5bb9\u3084\u69cb\u9020\u3001\u5916\u89b3\u3092\u52d5\u7684\u306b\u5909\u66f4\u3057\u305f\u308a\u66f4\u65b0\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u5f93\u6765\u306eJavaScript<\/a>\u958b\u767a\u3067\u306f\u3001DOM\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u64cd\u4f5c\u3059\u308b\u306b\u306f\u3001getElementById<\/code>\u3001querySelector<\/code>\u3001getElementsByClassName<\/code>\u306e\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u7279\u5b9a\u306e\u8981\u7d20\u3092\u9078\u629e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u4e00\u5ea6\u9078\u629e\u3059\u308b\u3068\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u66f4\u65b0\u3057\u305f\u308a\u3001\u30b9\u30bf\u30a4\u30eb\u3092\u5909\u66f4\u3057\u305f\u308a\u3001\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u7d10\u4ed8\u3051\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\/\/ HTML\n<div>\n  <input type=\"text\" id=\"myInput\" \/>\n  <button id=\"focusButton\">\u30af\u30ea\u30c3\u30af\u3067\u30d5\u30a9\u30fc\u30ab\u30b9<\/button>\n<\/div>\n\/\/ JavaScript\n<script>\n      const inputRef = document.getElementById('myInput');\n      const focusButton = document.getElementById('focusButton');\n      const handleFocus = function() {\n        inputRef.focus();\n      };\n      focusButton.addEventListener('click', handleFocus);\n<\/script><\/code><\/pre>\n
\u3057\u304b\u3057\u3001React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067DOM\u8981\u7d20\u3092\u6271\u3046\u5834\u5408\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4eee\u60f3DOM\u3068\u3044\u3046\u6027\u8cea\u304b\u3089\u3001\u305d\u3057\u3066\u52b9\u7387\u7684\u306b\u66f4\u65b0\u3092\u884c\u3046\u5fc5\u8981\u6027\u306e\u305f\u3081\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u7570\u306a\u308a\u307e\u3059\u3002\u958b\u767a\u8005\u306f\u3057\u3070\u3057\u3070\u3001DOM\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3057\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306b\u3001\u53c2\u7167\u3084jQuery<\/a>\u306e\u3088\u3046\u306a\u5916\u90e8\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u7528\u3059\u308b\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u306b\u983c\u308b\u3053\u3068\u304c\u4e00\u822c\u7684\u3067\u3057\u305f\u3002<\/p>\n
\u305d\u3057\u3066React\u306buseRef<\/code>\u30d5\u30c3\u30af\u304c\u5c0e\u5165\u3055\u308c\u305f\u3053\u3068\u3067\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067DOM\u8981\u7d20\u3092\u6271\u3046\u30d7\u30ed\u30bb\u30b9\u304c\u5927\u5e45\u306b\u5408\u7406\u5316\u3055\u308c\u3066\u3044\u307e\u3059\u3002useRef<\/code>\u30d5\u30c3\u30af\u306b\u3088\u308a\u3001DOM\u8981\u7d20\u3078\u306e\u53c2\u7167\u3092\u7c21\u5358\u306b\u4f5c\u6210\u3057\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u5185\u3067\u7c21\u5358\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3066\u64cd\u4f5c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
import { useRef } from 'react';\n\nconst FocusComponent = () => {\n  const inputRef = useRef(null);\n\n  const handleFocus = () => {\n    \/\/ \u5165\u529b\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\n    let inputElement = inputRef.current;\n\n   \/\/ DOM\u8981\u7d20\u3092\u5909\u66f4\n   inputElement.focus();\n  };\n \n return (\n    <div>\n      <input type=\"text\" ref={inputRef} \/>\n      <button onClick={handleFocus}>Focus Input<\/button>\n    <\/div>\n  );\n}<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u3001input<\/code>\u8981\u7d20\u3092\u6307\u3059\u53c2\u7167\u3068\u3057\u3066inputRef<\/code>\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002\u300c\u30af\u30ea\u30c3\u30af\u3067\u30d5\u30a9\u30fc\u30ab\u30b9\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001handleFocus<\/code>\u95a2\u6570\u304cinputRef.current.focus()<\/code>\u3092\u5229\u7528\u3057\u3066\u3001\u5165\u529b\u8981\u7d20\u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001useRef<\/code>\u30d5\u30c3\u30af\u304c\u3001React\u3067DOM\u8981\u7d20\u3092\u6271\u3046\u30d7\u30ed\u30bb\u30b9\u3092\u3044\u304b\u306b\u5358\u7d14\u5316\u3059\u308b\u304b\u3092\u793a\u3059\u826f\u3044\u4f8b\u3067\u3057\u3087\u3046\u3002<\/p>\n
\u5225\u306e\u4f8b\u3068\u3057\u3066\u3001\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u3068\u304d\u306b\u80cc\u666f\u3092\u5909\u66f4\u3059\u308b\u3068\u3044\u3046div<\/code>\u306e\u64cd\u4f5c\u3092\u884c\u3044\u305f\u3044\u3068\u3057\u307e\u3059\u3002<\/p>\n
import { useRef } from 'react';\n\nconst ExampleComponent = () => {\n  const divRef = useRef();\n\n  const handleClick = () => {\n    divRef.current.style.backgroundColor = 'red';\n  };\n\n  return (\n    <div>\n      <div ref={divRef}>\u3053\u308c\u306f\u30b5\u30f3\u30d7\u30eb\u306ediv\u3067\u3059<\/div>\n      <button onClick={handleClick}>\u8272\u3092\u5909\u66f4\u3059\u308b<\/button>\n    <\/div>\n  );\n}<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001useRef<\/code>\u30d5\u30c3\u30af\u3067divRef<\/code>\u3068\u3044\u3046\u53c2\u7167\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u306e\u53c2\u7167\u3092div<\/code>\u8981\u7d20\u306eref<\/code> prop\u306b\u5272\u308a\u5f53\u3066\u307e\u3059\u3002<\/p>\n
\u300c\u8272\u3092\u5909\u3048\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001handleClick<\/code>\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u3067\u306f\u3001divRef.current<\/code>\u3067div<\/code>\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001style.backgroundColor<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u300cred<\/strong>\u300d\u306b\u5909\u66f4\u3057\u3066\u3001div<\/code>\u8981\u7d20\u306e\u80cc\u666f\u8272\u3092\u5909\u66f4\u3057\u307e\u3059\u3002<\/p>\n
divRef.current.style.backgroundColor = 'red';<\/code><\/pre>\n
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\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u307e\u305f\u3044\u3060\u5024\u306e\u4fdd\u6301\u306f\u3001useRef<\/code>\u30d5\u30c3\u30af\u306e\u4fbf\u5229\u306a\u4f7f\u7528\u4f8b\u3067\u3059\u3002\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u3053\u3068\u306a\u304f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u901a\u3057\u3066\u5024\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u6709\u76ca\u3067\u3059\u3002<\/p>\n
\u3053\u306e\u6982\u5ff5\u3092\u3088\u304f\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u3001\u5b9f\u969b\u306e\u4f8b\u3092\u4f7f\u3063\u3066useRef<\/code>\u30d5\u30c3\u30af\u3068useState<\/code>\u30d5\u30c3\u30af\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
useState<\/a>\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u305f\u4f8b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
import { useState } from 'react';\n\nfunction CounterComponent() {\n  const [count, setCount] = useState(0);\n\n  const increment = () => {\n    setCount(count + 1);\n  };\n\n  return (\n    <div>\n      <p>Count: {count}<\/p>\n      <button onClick={increment}>Increment<\/button>\n    <\/div>\n  );\n}<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001useState<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u3066\u3001count<\/code>\u3068\u3044\u3046state\u5909\u6570\u3092\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002increment<\/code>\u95a2\u6570\u304c\u547c\u3070\u308c\u308b\u305f\u3073\u306b\u3001setCount<\/code>\u3092\u4f7f\u3063\u3066count<\/code>\u306e\u72b6\u614b\u304c\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u3001\u66f4\u65b0\u5f8c\u306ecount<\/code>\u306e\u5024\u304c\u53cd\u6620\u3055\u308c\u307e\u3059\u3002<\/p>\n
\"Page<\/p>\n
useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u305f\u4f8b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n
import React, { useRef } from 'react';\n\nfunction CounterComponent() {\n  const countRef = useRef(0);\n\n  const increment = () => {\n    countRef.current = countRef.current + 1;\n    console.log('Count:', countRef.current);\n  };\n\n  return (\n    <div>\n      <p>Count: {countRef.current}<\/p>\n      <button onClick={increment}>Increment<\/button>\n    <\/div>\n  );\n}<\/code><\/pre>\n
\u3053\u306e\u4f8b\u3067\u306f\u3001useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u3066\u3001\u521d\u671f\u50240<\/code>\u3067\u521d\u671f\u5316\u3055\u308c\u305f\u5909\u6570countRef<\/code>\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002increment<\/code>\u95a2\u6570\u304c\u547c\u3070\u308c\u308b\u305f\u3073\u306b\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u3053\u3068\u306a\u304f\u3001countRef.current<\/code>\u306e\u5024\u3092\u76f4\u63a5\u5909\u66f4\u3057\u307e\u3059\u3002\u5909\u66f4\u3057\u305f\u5f8c\u306e\u5024\u306f\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u8a18\u9332\u3055\u308c\u307e\u3059\u3002<\/p>\n
\"Page<\/p>\n
useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001countRef.current<\/code>\u306e\u5024\u304c\u5909\u66f4\u3055\u308c\u3066\u3082\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306f\u884c\u308f\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u3001\u5024\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3082\u306e\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u51e6\u7406\u306b\u306f\u5f71\u97ff\u3092\u53ca\u307c\u3057\u305f\u304f\u306a\u3044\u3068\u3044\u3046\u72b6\u6cc1\u3067\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002<\/p>\n
\u3053\u306e\u65b9\u6cd5\u3067useRef<\/code>\u30d5\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001ref<\/code>\u5024\u306e\u5909\u66f4\u306f\u81ea\u52d5\u3067\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u30c8\u30ea\u30ac\u30fc\u3057\u307e\u305b\u3093\u306e\u3067\u3053\u306e\u70b9\u306b\u306f\u3054\u6ce8\u610f\u304f\u3060\u3055\u3044\u3002\u66f4\u65b0\u3057\u305f\u5024\u3092UI\u306b\u53cd\u6620\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u624b\u52d5\u3067\u5909\u66f4\u3092\u51e6\u7406\u3059\u308b\u304b\u3001useRef<\/code>\u30d5\u30c3\u30af\u3092\u4ed6\u306e\u30d5\u30c3\u30af\u3084state\u5909\u6570\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\u307e\u3068\u3081<\/h2>\n
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001React\u306euseRef<\/code>\u30d5\u30c3\u30af\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3001\u305d\u306e\u76ee\u7684\u3001\u5b9f\u88c5\u3001\u5b9f\u969b\u306e\u7528\u9014\u3092\u6271\u3044\u307e\u3057\u305f\u3002\u307e\u305fDOM\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3084\u5909\u66f4\u3001\u5024\u306e\u4fdd\u6301\u306buseRef<\/code>\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\n
useRef<\/code>\u30d5\u30c3\u30af\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306f\u3001\u4f7f\u3044\u3059\u304e\u306a\u3044\u3053\u3068\u3067\u3059\u3002DOM\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3084\u64cd\u4f5c\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306e\u5024\u306e\u4fdd\u6301\u304c\u7279\u306b\u5fc5\u8981\u306a\u5834\u5408\u306b\u4f7f\u7528\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
useRef<\/code>\u30d5\u30c3\u30af\u306b\u306f\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3084\u30c8\u30e9\u30f3\u30b8\u30b7\u30e7\u30f3\u3001\u5024\u3084\u4e2d\u9593\u7d50\u679c\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306a\u3069\u3001React\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u969b\u7acb\u305f\u305b\u308b\u3055\u307e\u3056\u307e\u306a\u5b9f\u7528\u7684\u306a\u7528\u9014\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u6b21\u306eReact\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u69cb\u7bc9\u306e\u969b\u306b\u306f\u3001Kinsta\u306e\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d0\u30fc<\/a>\u3092\u7121\u6599\u3067\u30c7\u30d7\u30ed\u30a4\u306b\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n
\u3042\u306a\u305f\u306fuseRef\u30d5\u30c3\u30af\u306b\u3064\u3044\u3066\u3069\u3046\u601d\u3044\u307e\u3059\u304b\uff1f\u4ee5\u4e0b\u306e\u30b3\u30e1\u30f3\u30c8\u6b04\u3067\u304a\u805e\u304b\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
React\u306b\u304a\u3044\u3066\u30d5\u30c3\u30af\u3068\u306f\u3001\u958b\u767a\u8005\u304c\u30af\u30e9\u30b9\u30b3\u30f3\u30dd\u30fc …<\/p>\n","protected":false},"author":287,"featured_media":47090,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[],"topic":[802],"class_list":["post-47089","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","topic-react"],"yoast_head":"\nReact\u306euseRef\u30d5\u30c3\u30af\u306e\u57fa\u672c\u7684\u306a\u5f79\u5272\u3092\u7406\u89e3\u3059\u308b\uff5cKinsta\u00ae<\/title>\n<meta name=\"description\" content=\"useRef\u30d5\u30c3\u30af\u306e\u6a5f\u80fd\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u6df1\u304f\u6398\u308a\u4e0b\u3052\u307e\u3059\u3002useRef\u30d5\u30c3\u30af\u306e\u53ef\u80fd\u6027\u3092\u6700\u5927\u9650\u306b\u6d3b\u7528\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kinsta.com\/jp\/blog\/react-useref\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"React\u306euseRef\u30d5\u30c3\u30af\u306e\u57fa\u672c\u7684\u306a\u5f79\u5272\u3092\u7406\u89e3\u3059\u308b\" \/>\n<meta property=\"og:description\" content=\"useRef\u30d5\u30c3\u30af\u306e\u6a5f\u80fd\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u6df1\u304f\u6398\u308a\u4e0b\u3052\u307e\u3059\u3002useRef\u30d5\u30c3\u30af\u306e\u53ef\u80fd\u6027\u3092\u6700\u5927\u9650\u306b\u6d3b\u7528\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kinsta.com\/jp\/blog\/react-useref\/\" \/>\n<meta property=\"og:site_name\" content=\"Kinsta\u00ae\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Kinsta-Japan-334616080691171\/\" \/>\n<meta property=\"article:published_time\" content=\"2023-11-20T07:43:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-01T19:45:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kinsta.com\/jp\/wp-content\/uploads\/sites\/6\/2023\/06\/react-useref.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1460\" \/>\n\t<meta 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