diff --git a/client/.env.example b/client/.env.example
index 73b9023..b17a7d5 100644
--- a/client/.env.example
+++ b/client/.env.example
@@ -1,3 +1,3 @@
 NEXT_PUBLIC_FIREBASE_CONFIG={}
 NEXT_PUBLIC_AUTH_EMULATOR_URL=http://localhost:9099
-NEXT_PUBLIC_GA_ID=UA-SOMENUMBER-X
+NEXT_PUBLIC_GA_ID=
diff --git a/client/pages/_document.page.tsx b/client/pages/_document.page.tsx
index 096db61..c376a9b 100644
--- a/client/pages/_document.page.tsx
+++ b/client/pages/_document.page.tsx
@@ -8,13 +8,14 @@ function Document() {
     <Html lang="ja">
       <Head>
         <title>{APP_NAME}</title>
-        <meta name="robots" content="noindex,nofollow" />
         <meta name="description" content={APP_NAME} />
         <link rel="icon" href={staticPath.favicon_png} />
-        <script async src={`https://www.googletagmanager.com/gtag/js?id=${GA_ID}`} />
-        <script
-          dangerouslySetInnerHTML={{
-            __html: `
+        {GA_ID && (
+          <>
+            <script async src={`https://www.googletagmanager.com/gtag/js?id=${GA_ID}`} />
+            <script
+              dangerouslySetInnerHTML={{
+                __html: `
                 window.dataLayer = window.dataLayer || [];
                 function gtag(){dataLayer.push(arguments);}
                 gtag('js', new Date());
@@ -22,8 +23,10 @@ function Document() {
                   page_path: window.location.pathname,
                 });
               `,
-          }}
-        />
+              }}
+            />
+          </>
+        )}
       </Head>
       <body>
         <Main />
diff --git a/client/utils/gtag.ts b/client/utils/gtag.ts
index 71405ab..7da0e75 100644
--- a/client/utils/gtag.ts
+++ b/client/utils/gtag.ts
@@ -1,7 +1,7 @@
-export const GA_ID = process.env.NEXT_PUBLIC_GA_ID ?? '';
+export const GA_ID = process.env.NEXT_PUBLIC_GA_ID;
 
 export const gaPageview = (url: string) => {
-  window.gtag('config', GA_ID, { page_path: url });
+  if (GA_ID) window.gtag('config', GA_ID, { page_path: url });
 };
 
 export const gaEvent = ({
@@ -15,6 +15,8 @@ export const gaEvent = ({
   label: string;
   value?: number;
 }): void => {
+  if (!GA_ID) return;
+
   window.gtag('event', action, {
     event_category: category,
     event_label: label,
