diff --git a/frontend/src/pages/posts/PostListPage.tsx b/frontend/src/pages/posts/PostListPage.tsx
index 0af941d..e535138 100644
--- a/frontend/src/pages/posts/PostListPage.tsx
+++ b/frontend/src/pages/posts/PostListPage.tsx
@@ -65,7 +65,7 @@ export default () => {
   }, [loaderRef, loading])
 
   useLayoutEffect (() => {
-    const savedState = sessionStorage.getItem ('posts')
+    const savedState = sessionStorage.getItem (`posts:${ tagsQuery }`)
     if (savedState && navigationType === 'POP')
       {
 	const { posts, cursor, scroll } = JSON.parse (savedState)
@@ -76,8 +76,6 @@ export default () => {
 	  containerRef.current.scrollTop = scroll
 
 	loadMore (true)
-
-	sessionStorage.removeItem ('posts')
       }
     else
       {
@@ -124,7 +122,8 @@ export default () => {
 		    const statesToSave = {
 			posts, cursor,
 			scroll: containerRef.current?.scrollTop ?? 0 }
-		    sessionStorage.setItem ('posts', JSON.stringify (statesToSave))
+		    sessionStorage.setItem (`posts:${ tagsQuery }`,
+					    JSON.stringify (statesToSave))
 		  }} />)
 	       : !(loading) && '広場には何もありませんよ．'}
 	      {loading && 'Loading...'}