diff --git a/src/layouts/Layout.astro b/src/layouts/Layout.astro
index 483eed7..ba138f4 100644
--- a/src/layouts/Layout.astro
+++ b/src/layouts/Layout.astro
@@ -9,6 +9,15 @@ const { title } = Astro.props;
 <!DOCTYPE html>
 <html lang="ja">
   <head>
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-3ENE2XQ27C"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+    
+      gtag('config', 'G-3ENE2XQ27C');
+    </script>
     <meta charset="UTF-8" />
     <meta name="description" content="寒ブリとIT技術者のマリアージュ">
     <meta name="viewport" content="width=device-width" />
