diff --git a/route.php b/route.php
index 03fd991..2f5140c 100644
--- a/route.php
+++ b/route.php
@@ -21,6 +21,7 @@ if (DEBUG_MODE) {
 include(ROOT.'/util.php');
 
 $routes = [
+  Route::add('GET', 'robots.txt', Home::class.'@robots'),
   Route::add('GET', 'blog/{page}', Home::class.'@article'),
   Route::add('GET', 'about', Page::class.'@about'),
   Route::add('GET', 'monero', Page::class.'@monero'),
diff --git a/src/Site/Controller/Home.php b/src/Site/Controller/Home.php
index ac3b057..0ea4af1 100644
--- a/src/Site/Controller/Home.php
+++ b/src/Site/Controller/Home.php
@@ -157,6 +157,15 @@ denyaccess:
     }
   }
 
+  public function robots(array $params): void {
+    $txt = "User-Agent: *\nDisallow: /login/\nDisallow: /register/";
+    $tmpFile = tempnam(sys_get_temp_dir(), 'tmpl_');
+    file_put_contents($tmpFile, $txt);
+
+    include $tmpFile;
+    unlink($tmpFile);
+  }
+
   //------------------------------------------
   // 機能性
   //------------------------------------------