diff --git a/packages/backend/migration/1657570176749-remove-ads.ts b/packages/backend/migration/1657570176749-remove-ads.ts
new file mode 100644
index 000000000..03a4168aa
--- /dev/null
+++ b/packages/backend/migration/1657570176749-remove-ads.ts
@@ -0,0 +1,12 @@
+export class removeAds1657570176749 {
+    name = 'removeAds1657570176749'
+
+    async up(queryRunner) {
+        await queryRunner.query(`DROP TABLE "ad"`);
+    }
+
+    async down(queryRunner) {
+        await queryRunner.query(`CREATE TABLE public.ad ("id" character varying(32) NOT NULL, "createdAt" timestamp with time zone NOT NULL, "expiresAt" timestamp with time zone NOT NULL, "place" character varying(32) NOT NULL, "priority" character varying(32) NOT NULL, "url" character varying(1024) NOT NULL, "imageUrl" character varying(1024) NOT NULL, "memo" character varying(8192) NOT NULL, "ratio" integer DEFAULT 1 NOT NULL)`);
+    }
+
+}
diff --git a/packages/backend/src/db/postgre.ts b/packages/backend/src/db/postgre.ts
index f8e483939..95386f724 100644
--- a/packages/backend/src/db/postgre.ts
+++ b/packages/backend/src/db/postgre.ts
@@ -65,7 +65,6 @@ import { Channel } from '@/models/entities/channel.js';
 import { ChannelFollowing } from '@/models/entities/channel-following.js';
 import { ChannelNotePining } from '@/models/entities/channel-note-pining.js';
 import { RegistryItem } from '@/models/entities/registry-item.js';
-import { Ad } from '@/models/entities/ad.js';
 import { PasswordResetRequest } from '@/models/entities/password-reset-request.js';
 import { UserPending } from '@/models/entities/user-pending.js';
 
@@ -168,7 +167,6 @@ export const entities = [
 	ChannelFollowing,
 	ChannelNotePining,
 	RegistryItem,
-	Ad,
 	PasswordResetRequest,
 	UserPending,
 	Webhook,
diff --git a/packages/backend/src/models/entities/ad.ts b/packages/backend/src/models/entities/ad.ts
deleted file mode 100644
index 36b758f20..000000000
--- a/packages/backend/src/models/entities/ad.ts
+++ /dev/null
@@ -1,59 +0,0 @@
-import { Entity, Index, Column, PrimaryColumn } from 'typeorm';
-import { id } from '../id.js';
-
-@Entity()
-export class Ad {
-	@PrimaryColumn(id())
-	public id: string;
-
-	@Index()
-	@Column('timestamp with time zone', {
-		comment: 'The created date of the Ad.',
-	})
-	public createdAt: Date;
-
-	@Index()
-	@Column('timestamp with time zone', {
-		comment: 'The expired date of the Ad.',
-	})
-	public expiresAt: Date;
-
-	@Column('varchar', {
-		length: 32, nullable: false,
-	})
-	public place: string;
-
-	// 今は使われていないが将来的に活用される可能性はある
-	@Column('varchar', {
-		length: 32, nullable: false,
-	})
-	public priority: string;
-
-	@Column('integer', {
-		default: 1, nullable: false,
-	})
-	public ratio: number;
-
-	@Column('varchar', {
-		length: 1024, nullable: false,
-	})
-	public url: string;
-
-	@Column('varchar', {
-		length: 1024, nullable: false,
-	})
-	public imageUrl: string;
-
-	@Column('varchar', {
-		length: 8192, nullable: false,
-	})
-	public memo: string;
-
-	constructor(data: Partial<Ad>) {
-		if (data == null) return;
-
-		for (const [k, v] of Object.entries(data)) {
-			(this as any)[k] = v;
-		}
-	}
-}
diff --git a/packages/backend/src/models/index.ts b/packages/backend/src/models/index.ts
index 577b4044b..1005f8c70 100644
--- a/packages/backend/src/models/index.ts
+++ b/packages/backend/src/models/index.ts
@@ -59,7 +59,6 @@ import { MutedNote } from './entities/muted-note.js';
 import { ChannelFollowing } from './entities/channel-following.js';
 import { ChannelNotePining } from './entities/channel-note-pining.js';
 import { RegistryItem } from './entities/registry-item.js';
-import { Ad } from './entities/ad.js';
 import { PasswordResetRequest } from './entities/password-reset-request.js';
 import { UserPending } from './entities/user-pending.js';
 import { InstanceRepository } from './repositories/instance.js';
@@ -126,5 +125,4 @@ export const ChannelFollowings = db.getRepository(ChannelFollowing);
 export const ChannelNotePinings = db.getRepository(ChannelNotePining);
 export const RegistryItems = db.getRepository(RegistryItem);
 export const Webhooks = db.getRepository(Webhook);
-export const Ads = db.getRepository(Ad);
 export const PasswordResetRequests = db.getRepository(PasswordResetRequest);