diff --git a/frontend/src/pages/posts/PostDetailPage.tsx b/frontend/src/pages/posts/PostDetailPage.tsx
index 0c2b2e0..fe29eed 100644
--- a/frontend/src/pages/posts/PostDetailPage.tsx
+++ b/frontend/src/pages/posts/PostDetailPage.tsx
@@ -111,7 +111,9 @@ export default ({ user }: Props) => {
 		</Button>
 		<TabGroup>
 		  <Tab name="関聯">
-		    <PostList posts={post.related} />
+		    {post.related.length > 0
+		     ? <PostList posts={post.related} />
+		     : 'まだないよ（笑）'}
 		  </Tab>
 		  {['admin', 'member'].some (r => user?.role === r) && (
 		      <Tab name="編輯">