diff --git a/packages/backend/src/core/entities/RoleEntityService.ts b/packages/backend/src/core/entities/RoleEntityService.ts
index 2a7dc37bce..0f19d63745 100644
--- a/packages/backend/src/core/entities/RoleEntityService.ts
+++ b/packages/backend/src/core/entities/RoleEntityService.ts
@@ -13,6 +13,7 @@ import type { MiRole } from '@/models/Role.js';
 import { bindThis } from '@/decorators.js';
 import { DEFAULT_POLICIES } from '@/core/RoleService.js';
 import { IdService } from '@/core/IdService.js';
+import { Packed } from '@/misc/json-schema.js';
 
 @Injectable()
 export class RoleEntityService {
@@ -31,7 +32,7 @@ export class RoleEntityService {
 	public async pack(
 		src: MiRole['id'] | MiRole,
 		me?: { id: MiUser['id'] } | null | undefined,
-	) {
+	): Promise<Packed<'Role'>> {
 		const role = typeof src === 'object' ? src : await this.rolesRepository.findOneByOrFail({ id: src });
 
 		const assignedCount = await this.roleAssignmentsRepository.createQueryBuilder('assign')
@@ -67,6 +68,7 @@ export class RoleEntityService {
 			isModerator: role.isModerator,
 			isExplorable: role.isExplorable,
 			asBadge: role.asBadge,
+			copyOnMoveAccount: role.copyOnMoveAccount,
 			canEditMembersByModerator: role.canEditMembersByModerator,
 			displayOrder: role.displayOrder,
 			policies: policies,
diff --git a/packages/backend/src/models/json-schema/role.ts b/packages/backend/src/models/json-schema/role.ts
index 1685a806c9..cbf0d9f737 100644
--- a/packages/backend/src/models/json-schema/role.ts
+++ b/packages/backend/src/models/json-schema/role.ts
@@ -389,6 +389,12 @@ export const packedRoleSchema = {
 					optional: false, nullable: false,
 					example: false,
 				},
+				copyOnMoveAccount: {
+					type: 'boolean',
+					description: 'True if the role is going to be copied to dest account on account move.',
+					optional: false, nullable: false,
+					example: false,
+				},
 				canEditMembersByModerator: {
 					type: 'boolean',
 					optional: false, nullable: false,
diff --git a/packages/backend/src/server/api/endpoints/admin/roles/create.ts b/packages/backend/src/server/api/endpoints/admin/roles/create.ts
index e0c02f7a5d..195d1a509e 100644
--- a/packages/backend/src/server/api/endpoints/admin/roles/create.ts
+++ b/packages/backend/src/server/api/endpoints/admin/roles/create.ts
@@ -36,6 +36,7 @@ export const paramDef = {
 		isAdministrator: { type: 'boolean' },
 		isExplorable: { type: 'boolean', default: false }, // optional for backward compatibility
 		asBadge: { type: 'boolean' },
+		copyOnMoveAccount: { type: 'boolean' },
 		canEditMembersByModerator: { type: 'boolean' },
 		displayOrder: { type: 'number' },
 		policies: {
diff --git a/packages/backend/src/server/api/endpoints/admin/roles/update.ts b/packages/backend/src/server/api/endpoints/admin/roles/update.ts
index 465ad7aaaf..1ad5afc919 100644
--- a/packages/backend/src/server/api/endpoints/admin/roles/update.ts
+++ b/packages/backend/src/server/api/endpoints/admin/roles/update.ts
@@ -41,6 +41,7 @@ export const paramDef = {
 		isAdministrator: { type: 'boolean' },
 		isExplorable: { type: 'boolean' },
 		asBadge: { type: 'boolean' },
+		copyOnMoveAccount: { type: 'boolean' },
 		canEditMembersByModerator: { type: 'boolean' },
 		displayOrder: { type: 'number' },
 		policies: {
@@ -78,6 +79,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				isAdministrator: ps.isAdministrator,
 				isExplorable: ps.isExplorable,
 				asBadge: ps.asBadge,
+				copyOnMoveAccount: ps.copyOnMoveAccount,
 				canEditMembersByModerator: ps.canEditMembersByModerator,
 				displayOrder: ps.displayOrder,
 				policies: ps.policies,
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index 57c4824424..00534fd233 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -5132,6 +5132,11 @@ export type components = {
       isExplorable: boolean;
       /** @example false */
       asBadge: boolean;
+      /**
+       * @description True if the role is going to be copied to dest account on account move.
+       * @example false
+       */
+      copyOnMoveAccount: boolean;
       /** @example false */
       canEditMembersByModerator: boolean;
       policies: {
@@ -9347,6 +9352,7 @@ export type operations = {
           /** @default false */
           isExplorable?: boolean;
           asBadge: boolean;
+          copyOnMoveAccount?: boolean;
           canEditMembersByModerator: boolean;
           displayOrder: number;
           policies: Record<string, never>;
@@ -9622,6 +9628,7 @@ export type operations = {
           isAdministrator?: boolean;
           isExplorable?: boolean;
           asBadge?: boolean;
+          copyOnMoveAccount?: boolean;
           canEditMembersByModerator?: boolean;
           displayOrder?: number;
           policies?: Record<string, never>;