diff --git a/src/web/app/common/scripts/get-post-summary.ls b/src/web/app/common/scripts/get-post-summary.ls
index cc7bb0e37..67178bc32 100644
--- a/src/web/app/common/scripts/get-post-summary.ls
+++ b/src/web/app/common/scripts/get-post-summary.ls
@@ -3,7 +3,7 @@ get-post-summary = (post) ~>
 
 	# メディアが添付されているとき
 	if post.media?
-		summary += " (#{post.media.length}枚のメディア)"
+		summary += " (#{post.media.length}つのメディア)"
 
 	# 投票が添付されているとき
 	if post.poll?
diff --git a/src/web/app/desktop/tags/sub-post-content.tag b/src/web/app/desktop/tags/sub-post-content.tag
index 632d1b064..22fd81811 100644
--- a/src/web/app/desktop/tags/sub-post-content.tag
+++ b/src/web/app/desktop/tags/sub-post-content.tag
@@ -1,7 +1,7 @@
 <mk-sub-post-content>
 	<div class="body"><a class="reply" if={ post.reply_to_id }><i class="fa fa-reply"></i></a><span ref="text"></span><a class="quote" if={ post.repost_id } href={ '/post:' + post.repost_id }>RP: ...</a></div>
 	<details if={ post.media }>
-		<summary>({ post.media.length }枚の画像)</summary>
+		<summary>({ post.media.length }つのメディア)</summary>
 		<mk-images-viewer images={ post.media }></mk-images-viewer>
 	</details>
 	<style type="stylus">
diff --git a/src/web/app/mobile/tags/sub-post-content.tag b/src/web/app/mobile/tags/sub-post-content.tag
index c2699b6bf..851a39f03 100644
--- a/src/web/app/mobile/tags/sub-post-content.tag
+++ b/src/web/app/mobile/tags/sub-post-content.tag
@@ -1,7 +1,7 @@
 <mk-sub-post-content>
 	<div class="body"><a class="reply" if={ post.reply_to_id }><i class="fa fa-reply"></i></a><span ref="text"></span><a class="quote" if={ post.repost_id } href={ '/post:' + post.repost_id }>RP: ...</a></div>
 	<details if={ post.media }>
-		<summary>({ post.media.length }枚の画像)</summary>
+		<summary>({ post.media.length }つのメディア)</summary>
 		<mk-images-viewer images={ post.media }></mk-images-viewer>
 	</details>
 	<style type="stylus">