diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d0fbd0a2..2ce529204 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ You should also include the user name that made the change.
 ### Improvements
 - アニメーションを少なくする設定の時、MkPageHeaderのタブアニメーションを無効化
 - Backend: activitypub情報がcorsでブロックされないようヘッダーを追加
+- enhance: レートリミットを0%にできるように
 
 ### Bugfixes
 - Client: ユーザーページでアクティビティを見ることができない問題を修正
diff --git a/packages/backend/src/server/api/ApiCallService.ts b/packages/backend/src/server/api/ApiCallService.ts
index 395a1c468..2f3e7a44a 100644
--- a/packages/backend/src/server/api/ApiCallService.ts
+++ b/packages/backend/src/server/api/ApiCallService.ts
@@ -227,15 +227,17 @@ export class ApiCallService implements OnApplicationShutdown {
 			// TODO: 毎リクエスト計算するのもあれだしキャッシュしたい
 			const factor = user ? (await this.roleService.getUserPolicies(user.id)).rateLimitFactor : 1;
 
-			// Rate limit
-			await this.rateLimiterService.limit(limit as IEndpointMeta['limit'] & { key: NonNullable<string> }, limitActor, factor).catch(err => {
-				throw new ApiError({
-					message: 'Rate limit exceeded. Please try again later.',
-					code: 'RATE_LIMIT_EXCEEDED',
-					id: 'd5826d14-3982-4d2e-8011-b9e9f02499ef',
-					httpStatusCode: 429,
+			if (factor > 0) {
+				// Rate limit
+				await this.rateLimiterService.limit(limit as IEndpointMeta['limit'] & { key: NonNullable<string> }, limitActor, factor).catch(err => {
+					throw new ApiError({
+						message: 'Rate limit exceeded. Please try again later.',
+						code: 'RATE_LIMIT_EXCEEDED',
+						id: 'd5826d14-3982-4d2e-8011-b9e9f02499ef',
+						httpStatusCode: 429,
+					});
 				});
-			});
+			}
 		}
 
 		if (ep.meta.requireCredential || ep.meta.requireModerator || ep.meta.requireAdmin) {
diff --git a/packages/frontend/src/pages/admin/roles.editor.vue b/packages/frontend/src/pages/admin/roles.editor.vue
index 086537a94..d89a68f98 100644
--- a/packages/frontend/src/pages/admin/roles.editor.vue
+++ b/packages/frontend/src/pages/admin/roles.editor.vue
@@ -72,7 +72,7 @@
 					<MkSwitch v-model="policies.rateLimitFactor.useDefault" :readonly="readonly">
 						<template #label>{{ i18n.ts._role.useBaseValue }}</template>
 					</MkSwitch>
-					<MkRange :model-value="policies.rateLimitFactor.value * 100" :min="30" :max="300" :step="10" :text-converter="(v) => `${v}%`" @update:model-value="v => policies.rateLimitFactor.value = (v / 100)">
+					<MkRange :model-value="policies.rateLimitFactor.value * 100" :min="0" :max="400" :step="10" :text-converter="(v) => `${v}%`" @update:model-value="v => policies.rateLimitFactor.value = (v / 100)">
 						<template #label>{{ i18n.ts._role._options.rateLimitFactor }}</template>
 						<template #caption>{{ i18n.ts._role._options.descriptionOfRateLimitFactor }}</template>
 					</MkRange>