diff --git a/CHANGELOG.md b/CHANGELOG.md
index 06c9ee11e1..3aba40aef7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -74,6 +74,7 @@ You should also include the user name that made the change.
 - Push notification of Antenna note @tamaina
 - AVIF support @tamaina
 - Add Cloudflare Turnstile CAPTCHA support @CyberRex0
+- レートリミットをユーザーごとに調整可能に @syuilo
 - 非モデレーターでも、権限を持つロールをアサインされたユーザーはインスタンスの招待コードを発行できるように @syuilo
 - 非モデレーターでも、権限を持つロールをアサインされたユーザーはカスタム絵文字の追加、編集、削除を行えるように @syuilo
 - クリップおよびクリップ内のノートの作成可能数を設定可能に @syuilo
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index ea3cc6c9e7..a0802dd68c 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -972,6 +972,8 @@ _role:
     noteEachClipsMax: "クリップ内のノートの最大数"
     userListMax: "ユーザーリストの作成可能数"
     userEachUserListsMax: "ユーザーリスト内のユーザーの最大数"
+    rateLimitFactor: "レートリミット"
+    descriptionOfRateLimitFactor: "小さいほど制限が緩和され、大きいほど制限が強化されます。"
   _condition:
     isLocal: "ローカルユーザー"
     isRemote: "リモートユーザー"
diff --git a/packages/backend/src/core/RoleService.ts b/packages/backend/src/core/RoleService.ts
index 13fbfaf418..9fd612c96e 100644
--- a/packages/backend/src/core/RoleService.ts
+++ b/packages/backend/src/core/RoleService.ts
@@ -28,6 +28,7 @@ export type RoleOptions = {
 	noteEachClipsLimit: number;
 	userListLimit: number;
 	userEachUserListsLimit: number;
+	rateLimitFactor: number;
 };
 
 export const DEFAULT_ROLE: RoleOptions = {
@@ -45,6 +46,7 @@ export const DEFAULT_ROLE: RoleOptions = {
 	noteEachClipsLimit: 200,
 	userListLimit: 10,
 	userEachUserListsLimit: 50,
+	rateLimitFactor: 1,
 };
 
 @Injectable()
@@ -221,6 +223,7 @@ export class RoleService implements OnApplicationShutdown {
 			noteEachClipsLimit: Math.max(...getOptionValues('noteEachClipsLimit')),
 			userListLimit: Math.max(...getOptionValues('userListLimit')),
 			userEachUserListsLimit: Math.max(...getOptionValues('userEachUserListsLimit')),
+			rateLimitFactor: Math.max(...getOptionValues('rateLimitFactor')),
 		};
 	}
 
diff --git a/packages/backend/src/server/api/ApiCallService.ts b/packages/backend/src/server/api/ApiCallService.ts
index c19e861a5a..dcc9342a82 100644
--- a/packages/backend/src/server/api/ApiCallService.ts
+++ b/packages/backend/src/server/api/ApiCallService.ts
@@ -224,8 +224,11 @@ export class ApiCallService implements OnApplicationShutdown {
 				limit.key = ep.name;
 			}
 
+			// 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.getUserRoleOptions(user.id)).rateLimitFactor : 1;
+
 			// Rate limit
-			await this.rateLimiterService.limit(limit as IEndpointMeta['limit'] & { key: NonNullable<string> }, limitActor).catch(err => {
+			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',
diff --git a/packages/backend/src/server/api/RateLimiterService.ts b/packages/backend/src/server/api/RateLimiterService.ts
index c893b60baf..a9c34e363a 100644
--- a/packages/backend/src/server/api/RateLimiterService.ts
+++ b/packages/backend/src/server/api/RateLimiterService.ts
@@ -26,7 +26,7 @@ export class RateLimiterService {
 	}
 
 	@bindThis
-	public limit(limitation: IEndpointMeta['limit'] & { key: NonNullable<string> }, actor: string) {
+	public limit(limitation: IEndpointMeta['limit'] & { key: NonNullable<string> }, actor: string, factor = 1) {
 		return new Promise<void>((ok, reject) => {
 			if (this.disabled) ok();
 
@@ -34,7 +34,7 @@ export class RateLimiterService {
 			const min = (): void => {
 				const minIntervalLimiter = new Limiter({
 					id: `${actor}:${limitation.key}:min`,
-					duration: limitation.minInterval,
+					duration: limitation.minInterval * factor,
 					max: 1,
 					db: this.redisClient,
 				});
@@ -62,8 +62,8 @@ export class RateLimiterService {
 			const max = (): void => {
 				const limiter = new Limiter({
 					id: `${actor}:${limitation.key}`,
-					duration: limitation.duration,
-					max: limitation.max,
+					duration: limitation.duration * factor,
+					max: limitation.max / factor,
 					db: this.redisClient,
 				});
 		
diff --git a/packages/frontend/src/pages/admin/roles.editor.vue b/packages/frontend/src/pages/admin/roles.editor.vue
index fc5e2b9d12..bd166c9d48 100644
--- a/packages/frontend/src/pages/admin/roles.editor.vue
+++ b/packages/frontend/src/pages/admin/roles.editor.vue
@@ -38,6 +38,19 @@
 	<FormSlot>
 		<template #label>{{ i18n.ts._role.options }}</template>
 		<div class="_gaps_s">
+			<MkFolder>
+				<template #label>{{ i18n.ts._role._options.rateLimitFactor }}</template>
+				<template #suffix>{{ options_rateLimitFactor_useDefault ? i18n.ts._role.useBaseValue : `${Math.floor(options_rateLimitFactor_value * 100)}%` }}</template>
+				<div class="_gaps">
+					<MkSwitch v-model="options_rateLimitFactor_useDefault" :readonly="readonly">
+						<template #label>{{ i18n.ts._role.useBaseValue }}</template>
+					</MkSwitch>
+					<MkRange :model-value="options_rateLimitFactor_value * 100" :min="30" :max="300" :step="10" :text-converter="(v) => `${v}%`" @update:model-value="v => options_rateLimitFactor_value = (v / 100)">
+						<template #caption>{{ i18n.ts._role._options.descriptionOfRateLimitFactor }}</template>
+					</MkRange>
+				</div>
+			</MkFolder>
+
 			<MkFolder>
 				<template #label>{{ i18n.ts._role._options.gtlAvailable }}</template>
 				<template #suffix>{{ options_gtlAvailable_useDefault ? i18n.ts._role.useBaseValue : (options_gtlAvailable_value ? i18n.ts.yes : i18n.ts.no) }}</template>
@@ -241,9 +254,11 @@ import MkTextarea from '@/components/MkTextarea.vue';
 import MkFolder from '@/components/MkFolder.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkButton from '@/components/MkButton.vue';
+import MkRange from '@/components/MkRange.vue';
 import FormSlot from '@/components/form/slot.vue';
 import * as os from '@/os';
 import { i18n } from '@/i18n';
+import { instance } from '@/instance';
 
 const emit = defineEmits<{
 	(ev: 'created', payload: any): void;
@@ -266,33 +281,35 @@ let condFormula = $ref(role?.condFormula ?? { id: uuid(), type: 'isRemote' });
 let isPublic = $ref(role?.isPublic ?? false);
 let canEditMembersByModerator = $ref(role?.canEditMembersByModerator ?? false);
 let options_gtlAvailable_useDefault = $ref(role?.options?.gtlAvailable?.useDefault ?? true);
-let options_gtlAvailable_value = $ref(role?.options?.gtlAvailable?.value ?? false);
+let options_gtlAvailable_value = $ref(role?.options?.gtlAvailable?.value ?? instance.baseRole.gtlAvailable);
 let options_ltlAvailable_useDefault = $ref(role?.options?.ltlAvailable?.useDefault ?? true);
-let options_ltlAvailable_value = $ref(role?.options?.ltlAvailable?.value ?? false);
+let options_ltlAvailable_value = $ref(role?.options?.ltlAvailable?.value ?? instance.baseRole.ltlAvailable);
 let options_canPublicNote_useDefault = $ref(role?.options?.canPublicNote?.useDefault ?? true);
-let options_canPublicNote_value = $ref(role?.options?.canPublicNote?.value ?? false);
+let options_canPublicNote_value = $ref(role?.options?.canPublicNote?.value ?? instance.baseRole.canPublicNote);
 let options_canInvite_useDefault = $ref(role?.options?.canInvite?.useDefault ?? true);
-let options_canInvite_value = $ref(role?.options?.canInvite?.value ?? false);
+let options_canInvite_value = $ref(role?.options?.canInvite?.value ?? instance.baseRole.canInvite);
 let options_canManageCustomEmojis_useDefault = $ref(role?.options?.canManageCustomEmojis?.useDefault ?? true);
-let options_canManageCustomEmojis_value = $ref(role?.options?.canManageCustomEmojis?.value ?? false);
+let options_canManageCustomEmojis_value = $ref(role?.options?.canManageCustomEmojis?.value ?? instance.baseRole.canManageCustomEmojis);
 let options_driveCapacityMb_useDefault = $ref(role?.options?.driveCapacityMb?.useDefault ?? true);
-let options_driveCapacityMb_value = $ref(role?.options?.driveCapacityMb?.value ?? 0);
+let options_driveCapacityMb_value = $ref(role?.options?.driveCapacityMb?.value ?? instance.baseRole.driveCapacityMb);
 let options_pinLimit_useDefault = $ref(role?.options?.pinLimit?.useDefault ?? true);
-let options_pinLimit_value = $ref(role?.options?.pinLimit?.value ?? 0);
+let options_pinLimit_value = $ref(role?.options?.pinLimit?.value ?? instance.baseRole.pinLimit);
 let options_antennaLimit_useDefault = $ref(role?.options?.antennaLimit?.useDefault ?? true);
-let options_antennaLimit_value = $ref(role?.options?.antennaLimit?.value ?? 0);
+let options_antennaLimit_value = $ref(role?.options?.antennaLimit?.value ?? instance.baseRole.antennaLimit);
 let options_wordMuteLimit_useDefault = $ref(role?.options?.wordMuteLimit?.useDefault ?? true);
-let options_wordMuteLimit_value = $ref(role?.options?.wordMuteLimit?.value ?? 0);
+let options_wordMuteLimit_value = $ref(role?.options?.wordMuteLimit?.value ?? instance.baseRole.wordMuteLimit);
 let options_webhookLimit_useDefault = $ref(role?.options?.webhookLimit?.useDefault ?? true);
-let options_webhookLimit_value = $ref(role?.options?.webhookLimit?.value ?? 0);
+let options_webhookLimit_value = $ref(role?.options?.webhookLimit?.value ?? instance.baseRole.webhookLimit);
 let options_clipLimit_useDefault = $ref(role?.options?.clipLimit?.useDefault ?? true);
-let options_clipLimit_value = $ref(role?.options?.clipLimit?.value ?? 0);
+let options_clipLimit_value = $ref(role?.options?.clipLimit?.value ?? instance.baseRole.clipLimit);
 let options_noteEachClipsLimit_useDefault = $ref(role?.options?.noteEachClipsLimit?.useDefault ?? true);
-let options_noteEachClipsLimit_value = $ref(role?.options?.noteEachClipsLimit?.value ?? 0);
+let options_noteEachClipsLimit_value = $ref(role?.options?.noteEachClipsLimit?.value ?? instance.baseRole.noteEachClipsLimit);
 let options_userListLimit_useDefault = $ref(role?.options?.userListLimit?.useDefault ?? true);
-let options_userListLimit_value = $ref(role?.options?.userListLimit?.value ?? 0);
+let options_userListLimit_value = $ref(role?.options?.userListLimit?.value ?? instance.baseRole.userListLimit);
 let options_userEachUserListsLimit_useDefault = $ref(role?.options?.userEachUserListsLimit?.useDefault ?? true);
-let options_userEachUserListsLimit_value = $ref(role?.options?.userEachUserListsLimit?.value ?? 0);
+let options_userEachUserListsLimit_value = $ref(role?.options?.userEachUserListsLimit?.value ?? instance.baseRole.userEachUserListsLimit);
+let options_rateLimitFactor_useDefault = $ref(role?.options?.rateLimitFactor?.useDefault ?? true);
+let options_rateLimitFactor_value = $ref(role?.options?.rateLimitFactor?.value ?? instance.baseRole.rateLimitFactor);
 
 if (_DEV_) {
 	watch($$(condFormula), () => {
@@ -316,6 +333,7 @@ function getOptions() {
 		noteEachClipsLimit: { useDefault: options_noteEachClipsLimit_useDefault, value: options_noteEachClipsLimit_value },
 		userListLimit: { useDefault: options_userListLimit_useDefault, value: options_userListLimit_value },
 		userEachUserListsLimit: { useDefault: options_userEachUserListsLimit_useDefault, value: options_userEachUserListsLimit_value },
+		rateLimitFactor: { useDefault: options_rateLimitFactor_useDefault, value: options_rateLimitFactor_value },
 	};
 }
 
diff --git a/packages/frontend/src/pages/admin/roles.vue b/packages/frontend/src/pages/admin/roles.vue
index 68be6bbdd6..1ceead8b6c 100644
--- a/packages/frontend/src/pages/admin/roles.vue
+++ b/packages/frontend/src/pages/admin/roles.vue
@@ -8,6 +8,14 @@
 				<MkFolder>
 					<template #label>{{ i18n.ts._role.baseRole }}</template>
 					<div class="_gaps">
+						<MkFolder>
+							<template #label>{{ i18n.ts._role._options.rateLimitFactor }}</template>
+							<template #suffix>{{ Math.floor(options_rateLimitFactor * 100) }}%</template>
+							<MkRange :model-value="options_rateLimitFactor * 100" :min="30" :max="300" :step="10" :text-converter="(v) => `${v}%`" @update:model-value="v => options_rateLimitFactor = (v / 100)">
+								<template #caption>{{ i18n.ts._role._options.descriptionOfRateLimitFactor }}</template>
+							</MkRange>
+						</MkFolder>
+
 						<MkFolder>
 							<template #label>{{ i18n.ts._role._options.gtlAvailable }}</template>
 							<template #suffix>{{ options_gtlAvailable ? i18n.ts.yes : i18n.ts.no }}</template>
@@ -134,6 +142,7 @@ import MkPagination from '@/components/MkPagination.vue';
 import MkFolder from '@/components/MkFolder.vue';
 import MkSwitch from '@/components/MkSwitch.vue';
 import MkButton from '@/components/MkButton.vue';
+import MkRange from '@/components/MkRange.vue';
 import MkRolePreview from '@/components/MkRolePreview.vue';
 import * as os from '@/os';
 import { i18n } from '@/i18n';
@@ -159,6 +168,7 @@ let options_clipLimit = $ref(instance.baseRole.clipLimit);
 let options_noteEachClipsLimit = $ref(instance.baseRole.noteEachClipsLimit);
 let options_userListLimit = $ref(instance.baseRole.userListLimit);
 let options_userEachUserListsLimit = $ref(instance.baseRole.userEachUserListsLimit);
+let options_rateLimitFactor = $ref(instance.baseRole.rateLimitFactor);
 
 async function updateBaseRole() {
 	await os.apiWithDialog('admin/roles/update-default-role-override', {
@@ -177,6 +187,7 @@ async function updateBaseRole() {
 			noteEachClipsLimit: options_noteEachClipsLimit,
 			userListLimit: options_userListLimit,
 			userEachUserListsLimit: options_userEachUserListsLimit,
+			rateLimitFactor: options_rateLimitFactor,
 		},
 	});
 }