diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 680e70f61e..51a82a32b9 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -704,6 +704,7 @@ editCode: "コードを編集"
 apply: "適用"
 receiveAnnouncementFromInstance: "インスタンスからのお知らせを受け取る"
 emailNotification: "メール通知"
+inChannelSearch: "チャンネル内検索"
 
 _email:
   _follow:
diff --git a/src/client/pages/search.vue b/src/client/pages/search.vue
index ed92243cd2..5e79531b20 100644
--- a/src/client/pages/search.vue
+++ b/src/client/pages/search.vue
@@ -28,6 +28,7 @@ export default defineComponent({
 				limit: 10,
 				params: () => ({
 					query: this.$route.query.q,
+					channelId: this.$route.query.channel,
 				})
 			},
 		};
diff --git a/src/client/ui/chat/index.vue b/src/client/ui/chat/index.vue
index 79c0d53074..44f47447a7 100644
--- a/src/client/ui/chat/index.vue
+++ b/src/client/ui/chat/index.vue
@@ -99,7 +99,10 @@
 			<div class="right">
 				<div class="instance">{{ instanceName }}</div>
 				<XHeaderClock class="clock"/>
-				<button class="_button button search" @click="search" v-tooltip="$ts.search">
+				<button class="_button button search" v-if="tl.startsWith('channel:') && currentChannel" @click="inChannelSearch" v-tooltip="$ts.inChannelSearch">
+					<Fa :icon="faSearch"/>
+				</button>
+				<button class="_button button search" v-else @click="search" v-tooltip="$ts.search">
 					<Fa :icon="faSearch"/>
 				</button>
 				<button class="_button button follow" v-if="tl.startsWith('channel:') && currentChannel" :class="{ followed: currentChannel.isFollowing }" @click="toggleChannelFollow" v-tooltip="currentChannel.isFollowing ? $ts.unfollow : $ts.follow">
@@ -249,6 +252,15 @@ export default defineComponent({
 			search();
 		},
 
+		async inChannelSearch() {
+			const { canceled, result: query } = await os.dialog({
+				title: this.$ts.inChannelSearch,
+				input: true
+			});
+			if (canceled || query == null || query === '') return;
+			router.push(`/search?q=${encodeURIComponent(query)}&channel=${this.currentChannel.id}`);
+		},
+
 		top() {
 			window.scroll({ top: 0, behavior: 'smooth' });
 		},
diff --git a/src/server/api/endpoints/notes/search.ts b/src/server/api/endpoints/notes/search.ts
index 2c75d2a55a..1aca056299 100644
--- a/src/server/api/endpoints/notes/search.ts
+++ b/src/server/api/endpoints/notes/search.ts
@@ -46,6 +46,11 @@ export const meta = {
 			validator: $.optional.nullable.type(ID),
 			default: null
 		},
+
+		channelId: {
+			validator: $.optional.nullable.type(ID),
+			default: null
+		},
 	},
 
 	res: {
@@ -64,7 +69,15 @@ export const meta = {
 
 export default define(meta, async (ps, me) => {
 	if (es == null) {
-		const query = makePaginationQuery(Notes.createQueryBuilder('note'), ps.sinceId, ps.untilId)
+		const query = makePaginationQuery(Notes.createQueryBuilder('note'), ps.sinceId, ps.untilId);
+
+		if (ps.userId) {
+			query.andWhere('note.userId = :userId', { userId: ps.userId });
+		} else if (ps.channelId) {
+			query.andWhere('note.channelId = :channelId', { channelId: ps.channelId });
+		}
+
+		query
 			.andWhere('note.text ILIKE :q', { q: `%${ps.query}%` })
 			.leftJoinAndSelect('note.user', 'user');