diff --git a/locales/index.d.ts b/locales/index.d.ts
index 5cbe918183..59637f0bcf 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -7689,6 +7689,10 @@ export interface Locale extends ILocale {
              * Match subdomains
              */
             "isFromInstanceSubdomains": string;
+            /**
+             * User is from a bubble instance
+             */
+            "fromBubbleInstance": string;
             /**
              * Has X or fewer local followers
              */
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index e87c459d5c..039932b76d 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -262,6 +262,10 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 						return user.host.toLowerCase() === value.host.toLowerCase();
 					}
 				}
+				// Is the user from a local bubble instance
+				case 'fromBubbleInstance': {
+					return user.host != null && this.meta.bubbleInstances.includes(user.host);
+				}
 				// サスペンド済みユーザである
 				case 'isSuspended': {
 					return user.isSuspended;
diff --git a/packages/backend/src/models/Role.ts b/packages/backend/src/models/Role.ts
index 2caf3e0bd3..f6e3050830 100644
--- a/packages/backend/src/models/Role.ts
+++ b/packages/backend/src/models/Role.ts
@@ -56,6 +56,13 @@ type CondFormulaValueIsFromInstance = {
 	subdomains: boolean;
 };
 
+/**
+ * Is the user from a local bubble instance
+ */
+type CondFormulaValueFromBubbleInstance = {
+	type: 'fromBubbleInstance';
+};
+
 /**
  * 既に指定のマニュアルロールにアサインされている場合のみ成立とする
  */
@@ -234,6 +241,7 @@ export type RoleCondFormulaValue = { id: string } & (
 	CondFormulaValueIsLocal |
 	CondFormulaValueIsRemote |
 	CondFormulaValueIsFromInstance |
+	CondFormulaValueFromBubbleInstance |
 	CondFormulaValueIsSuspended |
 	CondFormulaValueIsLocked |
 	CondFormulaValueIsBot |
diff --git a/packages/frontend/src/pages/admin/RolesEditorFormula.vue b/packages/frontend/src/pages/admin/RolesEditorFormula.vue
index 0f3afd5b22..b7375b0faf 100644
--- a/packages/frontend/src/pages/admin/RolesEditorFormula.vue
+++ b/packages/frontend/src/pages/admin/RolesEditorFormula.vue
@@ -10,6 +10,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<option value="isLocal">{{ i18n.ts._role._condition.isLocal }}</option>
 			<option value="isRemote">{{ i18n.ts._role._condition.isRemote }}</option>
 			<option value="isFromInstance">{{ i18n.ts._role._condition.isFromInstance }}</option>
+			<option value="fromBubbleInstance">{{ i18n.ts._role._condition.fromBubbleInstance }}</option>
 			<option value="isSuspended">{{ i18n.ts._role._condition.isSuspended }}</option>
 			<option value="isLocked">{{ i18n.ts._role._condition.isLocked }}</option>
 			<option value="isBot">{{ i18n.ts._role._condition.isBot }}</option>
diff --git a/sharkey-locales/en-US.yml b/sharkey-locales/en-US.yml
index af60fb2a61..0ebc3a9390 100644
--- a/sharkey-locales/en-US.yml
+++ b/sharkey-locales/en-US.yml
@@ -245,6 +245,7 @@ _role:
     isFromInstance: "Is from a specific instance"
     isFromInstanceHost: "Hostname (case-insensitive)"
     isFromInstanceSubdomains: "Match subdomains"
+    fromBubbleInstance: "User is from a bubble instance"
     localFollowersLessThanOrEq: "Has X or fewer local followers"
     localFollowersMoreThanOrEq: "Has X or more local followers"
     localFollowingLessThanOrEq: "Follows X or fewer local accounts"