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+---
+title: 減算 (-)
+slug: Web/JavaScript/Reference/Operators/Subtraction
+tags:
+  - JavaScript
+  - Language feature
+  - Operator
+  - Reference
+translation_of: Web/JavaScript/Reference/Operators/Subtraction
+---
+<div>{{jsSidebar("Operators")}}</div>
+
+<p>減算演算子 (<code>-</code>) は2つのオペランドを減算し、それらの差を生成します。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/expressions-subtraction.html")}}</div>
+
+<div></div>
+
+
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox notranslate"><strong>Operator:</strong> <var>x</var> - <var>y</var>
+</pre>
+
+<h2 id="例">例</h2>
+
+<h3 id="数値による減算">数値による減算</h3>
+
+<pre class="brush: js notranslate">5 - 3     // 2
+3 - 5     // -2</pre>
+
+<h3 id="非数による減算">非数による減算</h3>
+
+<pre class="brush: js notranslate">'foo' - 3 // NaN</pre>
+
+<h2 id="仕様">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-subtraction-operator-minus', 'Subtraction operator')}}</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.subtraction")}}</p>
+
+<h2 id="関連項目">関連項目</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Addition">加算演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Multiplication">乗算演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Division">除算演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Remainder">剰余演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Exponentiation">べき乗演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Increment">インクリメント演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Decrement">デクリメント演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Unary_negation">単項マイナス演算子</a></li>
+ <li><a href="/ja/docs/Web/JavaScript/Reference/Operators/Unary_plus">単項プラス演算子</a></li>
+</ul>