diff --git a/packages/backend/src/core/QueueModule.ts b/packages/backend/src/core/QueueModule.ts
index f27fa8f3f4..f8e89684af 100644
--- a/packages/backend/src/core/QueueModule.ts
+++ b/packages/backend/src/core/QueueModule.ts
@@ -18,7 +18,7 @@ import {
 	SystemWebhookDeliverJobData,
 } from '../queue/types.js';
 import type { Provider } from '@nestjs/common';
-import { mActiveJobs, mDelayedJobs, mJobBlockedCounter, mWaitingJobs } from '@/queue/metrics.js';
+import { mActiveJobs, mDelayedJobs, mFailedJobs, mJobBlockedCounter, mWaitingJobs } from '@/queue/metrics.js';
 
 export type SystemQueue = Bull.Queue<Record<string, unknown>>;
 export type EndedPollNotificationQueue = Bull.Queue<EndedPollNotificationJobData>;
@@ -36,6 +36,7 @@ function withMetrics<T>(queue: Bull.Queue<T>): Bull.Queue<T> {
 			mActiveJobs?.set({ queue: queue.name }, await queue.getActiveCount());
 			mDelayedJobs?.set({ queue: queue.name }, await queue.getDelayedCount());
 			mWaitingJobs?.set({ queue: queue.name }, await queue.getWaitingCount());
+			mFailedJobs?.set({ queue: queue.name }, await queue.getFailedCount());
 		}, 2000);
 
 		queue.on('waiting', () => {
diff --git a/packages/backend/src/queue/metrics.ts b/packages/backend/src/queue/metrics.ts
index 2fa20a1754..ec658d2653 100644
--- a/packages/backend/src/queue/metrics.ts
+++ b/packages/backend/src/queue/metrics.ts
@@ -24,6 +24,12 @@ export const mWaitingJobs = metricGauge({
     labelNames: ['queue'],
 });
 
+export const mFailedJobs = metricGauge({
+    name: 'misskey_queue_failed_jobs',
+    help: 'Total number of failed jobs',
+    labelNames: ['queue'],
+});
+
 export const mStalledWorkerCounter = metricCounter({
     name: 'misskey_queue_stalled_workers_total',
     help: 'Total number of stalled workers',
diff --git a/packages/backend/src/queue/processors/InboxProcessorService.ts b/packages/backend/src/queue/processors/InboxProcessorService.ts
index a98e37376a..2e674b0548 100644
--- a/packages/backend/src/queue/processors/InboxProcessorService.ts
+++ b/packages/backend/src/queue/processors/InboxProcessorService.ts
@@ -152,9 +152,9 @@ export class InboxProcessorService implements OnApplicationShutdown {
 				// 対象が4xxならスキップ
 				if (err instanceof StatusError) {
 					if (!err.isRetryable) {
-						incCounter(mIncomingApReject, { reason: 'actor_key_unresolvable' });
 						throw new Bull.UnrecoverableError(`skip: Ignored deleted actors on both ends ${activity.actor} - ${err.statusCode}`);
 					}
+					incCounter(mIncomingApReject, { reason: 'actor_key_unresolvable' });
 					throw new Error(`Error in actor ${activity.actor} - ${err.statusCode}`);
 				}
 			}