diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index d0a06e976d..857e97a228 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -37,6 +37,7 @@ common:
   reload-to-apply-the-setting: "この設定を反映するにはページをリロードする必要があります。今すぐリロードしますか？"
   fetching-as-ap-object: "連合に照会中"
   unfollow-confirm: "{name}さんをフォロー解除しますか？"
+  delete-confirm: "この投稿を削除しますか？"
   signin-required: "ログインしてください"
   notification-type: "通知の種類"
   notification-types:
diff --git a/src/client/app/common/scripts/note-mixin.ts b/src/client/app/common/scripts/note-mixin.ts
index fc82e78cec..e433ba49cf 100644
--- a/src/client/app/common/scripts/note-mixin.ts
+++ b/src/client/app/common/scripts/note-mixin.ts
@@ -4,6 +4,7 @@ import shouldMuteNote from './should-mute-note';
 import MkNoteMenu from '../views/components/note-menu.vue';
 import MkReactionPicker from '../views/components/reaction-picker.vue';
 import pleaseLogin from './please-login';
+import i18n from '../../i18n';
 
 function focus(el, fn) {
 	const target = fn(el);
@@ -21,6 +22,8 @@ type Opts = {
 };
 
 export default (opts: Opts = {}) => ({
+	i18n: i18n(),
+
 	data() {
 		return {
 			showContent: false,
@@ -175,8 +178,16 @@ export default (opts: Opts = {}) => ({
 		},
 
 		del() {
-			this.$root.api('notes/delete', {
-				noteId: this.appearNote.id
+			this.$root.dialog({
+				type: 'warning',
+				text: this.$t('@.delete-confirm'),
+				showCancelButton: true
+			}).then(({ canceled }) => {
+				if (canceled) return;
+
+				this.$root.api('notes/delete', {
+					noteId: this.appearNote.id
+				});
 			});
 		},