diff --git a/packages/backend/src/server/api/endpoints/users/show.ts b/packages/backend/src/server/api/endpoints/users/show.ts
index bd81989..8aaf8ca 100644
--- a/packages/backend/src/server/api/endpoints/users/show.ts
+++ b/packages/backend/src/server/api/endpoints/users/show.ts
@@ -97,6 +97,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			const isModerator = await this.roleService.isModerator(me);
 			ps.username = ps.username?.trim();
 
+			const authed = me !== null
+
 			if (ps.userIds) {
 				if (ps.userIds.length === 0) {
 					return [];
@@ -112,7 +114,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				// リクエストされた通りに並べ替え
 				const _users: MiUser[] = [];
 				for (const id of ps.userIds) {
-					_users.push(users.find(x => x.id === id)!);
+					const user = users.find(x => x.id === id)
+					if (user && (authed || user.host === null)) {
+						_users.push(user);
+					}
 				}
 
 				return await Promise.all(_users.map(u => this.userEntityService.pack(u, me, {
@@ -137,6 +142,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 					throw new ApiError(meta.errors.noSuchUser);
 				}
 
+				if (!authed && user.host !== null) {
+					throw new ApiError({
+						code: 'X_REMOTE_REDIRECT',
+						message: 'Redirect to remote user',
+						id: 'X_REMOTE_REDIRECT',
+					}, user.uri);
+				}
+
 				if (user.host == null) {
 					if (me == null && ip != null) {
 						this.perUserPvChart.commitByVisitor(user, ip);
diff --git a/packages/backend/src/server/web/ClientServerService.ts b/packages/backend/src/server/web/ClientServerService.ts
index cb41c4f..8199e3c 100644
--- a/packages/backend/src/server/web/ClientServerService.ts
+++ b/packages/backend/src/server/web/ClientServerService.ts
@@ -526,6 +526,11 @@ export class ClientServerService {
 
 			if (user != null) {
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: user.id });
+				if (user.host !== null) {
+					reply.redirect(301, profile.url);
+					return;
+				}
+
 				const meta = await this.metaService.fetch();
 				const me = profile.fields
 					? profile.fields
diff --git a/packages/frontend/src/pages/user/index.vue b/packages/frontend/src/pages/user/index.vue
index ebe4176..0cd39f3 100644
--- a/packages/frontend/src/pages/user/index.vue
+++ b/packages/frontend/src/pages/user/index.vue
@@ -70,6 +70,10 @@ function fetchUser(): void {
 	misskeyApi('users/show', Misskey.acct.parse(props.acct)).then(u => {
 		user.value = u;
 	}).catch(err => {
+		if (err.code === 'X_REMOTE_REDIRECT') {
+			location.replace(err.info);
+			return;
+		}
 		error.value = err;
 	});
 }