diff --git a/packages/backend/src/core/ChannelMutingService.ts b/packages/backend/src/core/ChannelMutingService.ts
index 4917f80c37..041ac19305 100644
--- a/packages/backend/src/core/ChannelMutingService.ts
+++ b/packages/backend/src/core/ChannelMutingService.ts
@@ -5,8 +5,9 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import Redis from 'ioredis';
+import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
-import type { ChannelMutingRepository, ChannelsRepository, MiChannel, MiUser } from '@/models/_.js';
+import type { ChannelMutingRepository, ChannelsRepository, MiChannel, MiChannelMuting, MiUser } from '@/models/_.js';
 import { IdService } from '@/core/IdService.js';
 import { GlobalEvents, GlobalEventService } from '@/core/GlobalEventService.js';
 import { bindThis } from '@/decorators.js';
@@ -64,7 +65,7 @@ export class ChannelMutingService {
 			.where('channel_muting.userId = :userId', { userId: params.requestUserId })
 			.andWhere(qb => {
 				qb.where('channel_muting.expiresAt IS NULL')
-					.orWhere('channel_muting.expiresAt > :now:', { now: new Date() });
+					.orWhere('channel_muting.expiresAt > :now', { now: new Date() });
 			});
 
 		if (opts?.joinUser) {
@@ -78,6 +79,32 @@ export class ChannelMutingService {
 		return q.getMany();
 	}
 
+	/**
+	 * 期限切れのチャンネルミュート情報を取得する.
+	 *
+	 * @param [opts]
+	 * @param {(boolean|undefined)} [opts.joinUser=undefined] チャンネルミュートを設定したユーザ情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 * @param {(boolean|undefined)} [opts.joinChannel=undefined] ミュート先のチャンネル情報をJOINするかどうか(falseまたは省略時はJOINしない).
+	 */
+	public async findExpiredMutings(opts?: {
+		joinUser?: boolean;
+		joinChannel?: boolean;
+	}): Promise<MiChannelMuting[]> {
+		const now = new Date();
+		const q = this.channelMutingRepository.createQueryBuilder('channel_muting')
+			.where('channel_muting.expiresAt < :now', { now });
+
+		if (opts?.joinUser) {
+			q.innerJoinAndSelect('channel_muting.user', 'user');
+		}
+
+		if (opts?.joinChannel) {
+			q.leftJoinAndSelect('channel_muting.channel', 'channel');
+		}
+
+		return q.getMany();
+	}
+
 	/**
 	 * 既にミュートされているかどうかをキャッシュから取得する.
 	 * @param params
@@ -136,6 +163,20 @@ export class ChannelMutingService {
 		});
 	}
 
+	/**
+	 * 期限切れのチャンネルミュート情報を削除する.
+	 */
+	@bindThis
+	public async eraseExpiredMutings(): Promise<void> {
+		const expiredMutings = await this.findExpiredMutings();
+		await this.channelMutingRepository.delete({ id: In(expiredMutings.map(x => x.id)) });
+
+		const userIds = [...new Set(expiredMutings.map(x => x.userId))];
+		for (const userId of userIds) {
+			this.userMutingChannelsCache.refresh(userId).then();
+		}
+	}
+
 	@bindThis
 	private async onMessage(_: string, data: string): Promise<void> {
 		const obj = JSON.parse(data);
diff --git a/packages/backend/src/queue/processors/CheckExpiredMutingsProcessorService.ts b/packages/backend/src/queue/processors/CheckExpiredMutingsProcessorService.ts
index 448fc9c763..e898e6dd48 100644
--- a/packages/backend/src/queue/processors/CheckExpiredMutingsProcessorService.ts
+++ b/packages/backend/src/queue/processors/CheckExpiredMutingsProcessorService.ts
@@ -4,14 +4,13 @@
  */
 
 import { Inject, Injectable } from '@nestjs/common';
-import { In } from 'typeorm';
 import { DI } from '@/di-symbols.js';
 import type { MutingsRepository } from '@/models/_.js';
 import type Logger from '@/logger.js';
 import { bindThis } from '@/decorators.js';
 import { UserMutingService } from '@/core/UserMutingService.js';
+import { ChannelMutingService } from '@/core/ChannelMutingService.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
-import type * as Bull from 'bullmq';
 
 @Injectable()
 export class CheckExpiredMutingsProcessorService {
@@ -22,6 +21,7 @@ export class CheckExpiredMutingsProcessorService {
 		private mutingsRepository: MutingsRepository,
 
 		private userMutingService: UserMutingService,
+		private channelMutingService: ChannelMutingService,
 		private queueLoggerService: QueueLoggerService,
 	) {
 		this.logger = this.queueLoggerService.logger.createSubLogger('check-expired-mutings');
@@ -41,6 +41,8 @@ export class CheckExpiredMutingsProcessorService {
 			await this.userMutingService.unmute(expired);
 		}
 
+		await this.channelMutingService.eraseExpiredMutings();
+
 		this.logger.succ('All expired mutings checked.');
 	}
 }