diff --git a/stopwatch.html b/stopwatch.html
index 03ade57..ac835da 100644
--- a/stopwatch.html
+++ b/stopwatch.html
@@ -1,6 +1,15 @@
 <!DOCTYPE html>
 <html lang='ja'>
 <head>
+    <!-- Google tag (gtag.js) -->
+    <script async src="https://www.googletagmanager.com/gtag/js?id=G-SLCHF8P25K"></script>
+    <script>
+      window.dataLayer = window.dataLayer || [];
+      function gtag(){dataLayer.push(arguments);}
+      gtag('js', new Date());
+      gtag('config', 'G-SLCHF8P25K');
+    </script>
+    <script type="text/javascript" data-cmp-ab="1" src="https://cdn.consentmanager.net/delivery/autoblocking/31566d9c7185e.js" data-cmp-host="a.delivery.consentmanager.net" data-cmp-cdn="cdn.consentmanager.net" data-cmp-codesrc="16"></script>
     <meta charset='utf-8'>
     <meta name='viewport' content='user-scalable=no,width=device-width,initial-scale=1'>
     <title>stopwatch</title>
