diff --git a/packages/backend/src/core/SearchService.ts b/packages/backend/src/core/SearchService.ts
index 1c18a52fa..e68fde088 100644
--- a/packages/backend/src/core/SearchService.ts
+++ b/packages/backend/src/core/SearchService.ts
@@ -117,6 +117,7 @@ export class SearchService {
 	public async searchNote(q: string, me: User | null, opts: {
 		userId?: Note['userId'] | null;
 		channelId?: Note['channelId'] | null;
+		host?: string | null;
 	}, pagination: {
 		untilId?: Note['id'];
 		sinceId?: Note['id'];
@@ -131,6 +132,13 @@ export class SearchService {
 			if (pagination.sinceId) filter.qs.push({ op: '>', k: 'createdAt', v: this.idService.parse(pagination.sinceId).date.getTime() });
 			if (opts.userId) filter.qs.push({ op: '=', k: 'userId', v: opts.userId });
 			if (opts.channelId) filter.qs.push({ op: '=', k: 'channelId', v: opts.channelId });
+			if (opts.host) {
+				if (opts.host === '.') {
+					// TODO: Meilisearchが2023/05/07現在値がNULLかどうかのクエリが書けない
+				} else {
+					filter.qs.push({ op: '=', k: 'userHost', v: opts.host });
+				}
+			}
 			const res = await this.meilisearchNoteIndex!.search(q, {
 				sort: ['createdAt:desc'],
 				matchingStrategy: 'all',
diff --git a/packages/backend/src/server/api/endpoints/notes/search.ts b/packages/backend/src/server/api/endpoints/notes/search.ts
index 990ba526d..f6385400c 100644
--- a/packages/backend/src/server/api/endpoints/notes/search.ts
+++ b/packages/backend/src/server/api/endpoints/notes/search.ts
@@ -42,8 +42,7 @@ export const paramDef = {
 		offset: { type: 'integer', default: 0 },
 		host: {
 			type: 'string',
-			nullable: true,
-			description: 'The local host is represented with `null`.',
+			description: 'The local host is represented with `.`.',
 		},
 		userId: { type: 'string', format: 'misskey:id', nullable: true, default: null },
 		channelId: { type: 'string', format: 'misskey:id', nullable: true, default: null },
@@ -73,6 +72,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			const notes = await this.searchService.searchNote(ps.query, me, {
 				userId: ps.userId,
 				channelId: ps.channelId,
+				host: ps.host,
 			}, {
 				untilId: ps.untilId,
 				sinceId: ps.sinceId,