diff --git a/src/models/instance.ts b/src/models/instance.ts
index 7a94a0a041..904ed95dc0 100644
--- a/src/models/instance.ts
+++ b/src/models/instance.ts
@@ -44,12 +44,17 @@ export interface IInstance {
 	followersCount: number;
 
 	/**
-	 * 最近の通信日時
+	 * 直近のリクエスト送信日時
 	 */
 	latestRequestSentAt?: Date;
 
 	/**
-	 * 最近の通信のHTTPステータス
+	 * 直近のリクエスト送信時のHTTPステータスコード
 	 */
 	latestStatus?: number;
+
+	/**
+	 * 直近のリクエスト受信日時
+	 */
+	latestRequestReceivedAt?: Date;
 }
diff --git a/src/queue/processors/http/process-inbox.ts b/src/queue/processors/http/process-inbox.ts
index 3cc13cbdaa..d88f00a098 100644
--- a/src/queue/processors/http/process-inbox.ts
+++ b/src/queue/processors/http/process-inbox.ts
@@ -8,6 +8,8 @@ import { toUnicode } from 'punycode';
 import { URL } from 'url';
 import { publishApLogStream } from '../../../services/stream';
 import Logger from '../../../misc/logger';
+import { registerOrFetchInstanceDoc } from '../../../services/register-or-fetch-instance-doc';
+import Instance from '../../../models/instance';
 
 const logger = new Logger('inbox');
 
@@ -101,6 +103,15 @@ export default async (job: bq.Job, done: any): Promise<void> => {
 	});
 	//#endregion
 
+	// Update stats
+	registerOrFetchInstanceDoc(user.host).then(i => {
+		Instance.update({ _id: i._id }, {
+			$set: {
+				latestRequestReceivedAt: new Date()
+			}
+		});
+	});
+
 	// アクティビティを処理
 	try {
 		await perform(user, activity);