diff --git a/bemani/frontend/app.py b/bemani/frontend/app.py
index afe74cd..53990ef 100644
--- a/bemani/frontend/app.py
+++ b/bemani/frontend/app.py
@@ -68,6 +68,7 @@ def after_request(response: Response) -> Response:
         response.cache_control.no_cache = True
         response.cache_control.must_revalidate = True
         response.cache_control.private = True
+    response.headers["X-Robots-Tag"] = "noindex"
     return response
 
 
diff --git a/bemani/frontend/templates/base.html b/bemani/frontend/templates/base.html
index 78bcf3d..f4c09ca 100644
--- a/bemani/frontend/templates/base.html
+++ b/bemani/frontend/templates/base.html
@@ -11,7 +11,8 @@
         <link rel="stylesheet" type="text/css" href="{{ theme_url('section.css') }}?{{ cache_bust }}" />
         <link rel="stylesheet" type="text/css" href="{{ theme_url('table.css') }}?{{ cache_bust }}" />
         <link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='jquery-confirm.css') }}?{{ cache_bust }}" />
-        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+        <meta name="robots" content="noindex" />
         <script type="text/javascript" src="{{ url_for('static', filename='chart.bundle.min.js') }}?{{ cache_bust }}"></script>
         <script type="text/javascript" src="{{ url_for('static', filename='date.format.min.js') }}?{{ cache_bust }}"></script>
         <script type="text/javascript" src="{{ url_for('static', filename='jquery-1.12.4.min.js') }}?{{ cache_bust }}"></script>