diff --git a/CHANGELOG.md b/CHANGELOG.md
index ee82834de7b1..9766dff1daba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ## 2024.11.1
 
 ### General
--
+- ドメインをまたいだ照会ができない問題を修正
 
 ### Client
 - Enhance: PC画面でチャンネルが複数列で表示されるように  
diff --git a/packages/backend/src/core/activitypub/ApResolverService.ts b/packages/backend/src/core/activitypub/ApResolverService.ts
index b0b35274ea0f..b310b0e757c1 100644
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@@ -71,7 +71,7 @@ export class Resolver {
 	}
 
 	@bindThis
-	public async resolve(value: string | IObject): Promise<IObject> {
+	public async resolve(value: string | IObject, allowHostMismatch = false): Promise<IObject> {
 		if (typeof value !== 'string') {
 			return value;
 		}
@@ -126,8 +126,10 @@ export class Resolver {
 			throw new Error('invalid AP object: missing id');
 		}
 
-		if (this.utilityService.punyHost(object.id) !== this.utilityService.punyHost(value)) {
-			throw new Error(`invalid AP object ${value}: id ${object.id} has different host`);
+		if (!allowHostMismatch) {
+			if (this.utilityService.punyHost(object.id) !== this.utilityService.punyHost(value)) {
+				throw new Error(`invalid AP object ${value}: id ${object.id} has different host`);
+			}
 		}
 
 		return object;
diff --git a/packages/backend/src/server/api/endpoints/ap/show.ts b/packages/backend/src/server/api/endpoints/ap/show.ts
index 24d5a7b0f1f5..00d3bfd80735 100644
--- a/packages/backend/src/server/api/endpoints/ap/show.ts
+++ b/packages/backend/src/server/api/endpoints/ap/show.ts
@@ -125,7 +125,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 		// リモートから一旦オブジェクトフェッチ
 		const resolver = this.apResolverService.createResolver();
-		const object = await resolver.resolve(uri) as any;
+		const object = await resolver.resolve(uri, true) as any;
 
 		// /@user のような正規id以外で取得できるURIが指定されていた場合、ここで初めて正規URIが確定する
 		// これはDBに存在する可能性があるため再度DB検索