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+---
+title: 代入 (=)
+slug: Web/JavaScript/Reference/Operators/Assignment
+tags:
+  - Assignment operator
+  - JavaScript
+  - Language feature
+  - Operator
+  - Reference
+translation_of: Web/JavaScript/Reference/Operators/Assignment
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>代入（単純代入）演算子 (<code>=</code>) は、変数に値を代入するために使用されます。割り当て操作は、割り当てられた値を評価します。 単一の値を複数の変数に割り当てるため、代入演算子の連鎖が可能です。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-assignment.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> x = y
+</pre>
+
+<h2 id="例">例</h2>
+
+<h3 id="代入と連鎖">代入と連鎖</h3>
+
+<pre class="brush: js notranslate">// 以下の変数を想定
+//  x = 5
+//  y = 10
+//  z = 25
+
+x = y     // x は 10
+x = y = z // x, y そして z は全て 25</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様書</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-assignment-operators', 'Assignment operators')}}</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="ブラウザーの互換性">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("javascript.operators.assignment")}}</p>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/JavaScript/Guide/Expressions_and_Operators#Assignment">代入演算子</a></li>
+</ul>