diff --git a/packages/backend/src/server/api/endpoints/users/search.ts b/packages/backend/src/server/api/endpoints/users/search.ts
index 177441bc7..1180de361 100644
--- a/packages/backend/src/server/api/endpoints/users/search.ts
+++ b/packages/backend/src/server/api/endpoints/users/search.ts
@@ -52,6 +52,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 		super(meta, paramDef, async (ps, me) => {
 			const activeThreshold = new Date(Date.now() - (1000 * 60 * 60 * 24 * 30)); // 30日
 
+			ps.query = ps.query.trim();
 			const isUsername = ps.query.startsWith('@');
 
 			let users: User[] = [];
diff --git a/packages/backend/src/server/api/endpoints/users/show.ts b/packages/backend/src/server/api/endpoints/users/show.ts
index ba432c273..8e25af64f 100644
--- a/packages/backend/src/server/api/endpoints/users/show.ts
+++ b/packages/backend/src/server/api/endpoints/users/show.ts
@@ -91,6 +91,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 			let user;
 
 			const isModerator = await this.roleService.isModerator(me);
+			ps.username = ps.username?.trim();
 
 			if (ps.userIds) {
 				if (ps.userIds.length === 0) {
diff --git a/packages/frontend/src/pages/search.user.vue b/packages/frontend/src/pages/search.user.vue
index bd1389ffe..8e4a4a78c 100644
--- a/packages/frontend/src/pages/search.user.vue
+++ b/packages/frontend/src/pages/search.user.vue
@@ -67,7 +67,7 @@ async function search() {
 		endpoint: 'users/search',
 		limit: 10,
 		params: {
-			query: searchQuery,
+			query: query,
 			origin: searchOrigin,
 		},
 	};
diff --git a/packages/frontend/src/scripts/lookup.ts b/packages/frontend/src/scripts/lookup.ts
index 0b594e341..a55868368 100644
--- a/packages/frontend/src/scripts/lookup.ts
+++ b/packages/frontend/src/scripts/lookup.ts
@@ -6,9 +6,10 @@ import { Router } from '@/nirax';
 export async function lookup(router?: Router) {
 	const _router = router ?? mainRouter;
 
-	const { canceled, result: query } = await os.inputText({
+	const { canceled, result: temp } = await os.inputText({
 		title: i18n.ts.lookup,
 	});
+	const query = temp ? temp.trim() : '';
 	if (canceled) return;
 
 	if (query.startsWith('@') && !query.includes(' ')) {