diff --git a/CHANGELOG.md b/CHANGELOG.md
index eec73bdaac..f44e247359 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@
 - Enhance: ScratchpadにUIインスペクターを追加
 - Enhance: Play編集画面の項目の並びを少しリデザイン
 - Enhance: 各種メニューをドロワー表示するかどうか設定可能に
+- Enhance: AiScriptのMk:C:containerのオプションに`borderStyle`と`borderRadius`を追加
 - Fix: サーバーメトリクスが2つ以上あるとリロード直後の表示がおかしくなる問題を修正
 - Fix: コントロールパネル内のAp requests内のチャートの表示がおかしかった問題を修正
 - Fix: 月の違う同じ日はセパレータが表示されないのを修正
diff --git a/packages/frontend/src/components/MkAsUi.vue b/packages/frontend/src/components/MkAsUi.vue
index 18e8e7542e..b50a7fea5c 100644
--- a/packages/frontend/src/components/MkAsUi.vue
+++ b/packages/frontend/src/components/MkAsUi.vue
@@ -54,7 +54,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<MkAsUi v-if="!g(child).hidden" :component="g(child)" :components="props.components" :size="size"/>
 		</template>
 	</MkFolder>
-	<div v-else-if="c.type === 'container'" :class="[$style.container, { [$style.fontSerif]: c.font === 'serif', [$style.fontMonospace]: c.font === 'monospace' }]" :style="{ textAlign: c.align, backgroundColor: c.bgColor, color: c.fgColor, borderWidth: c.borderWidth ? `${c.borderWidth}px` : 0, borderColor: c.borderColor ?? 'var(--divider)', padding: c.padding ? `${c.padding}px` : 0, borderRadius: c.rounded ? '8px' : 0 }">
+	<div v-else-if="c.type === 'container'" :class="[$style.container, { [$style.fontSerif]: c.font === 'serif', [$style.fontMonospace]: c.font === 'monospace' }]" :style="containerStyle">
 		<template v-for="child in c.children" :key="child">
 			<MkAsUi v-if="!g(child).hidden" :component="g(child)" :components="props.components" :size="size" :align="c.align"/>
 		</template>
@@ -63,7 +63,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { Ref, ref } from 'vue';
+import { Ref, ref, computed } from 'vue';
 import * as os from '@/os.js';
 import MkButton from '@/components/MkButton.vue';
 import MkInput from '@/components/MkInput.vue';
@@ -97,6 +97,29 @@ function g(id) {
 	} as AsUiRoot;
 }
 
+const containerStyle = computed(() => {
+	if (c.type !== 'container') return undefined;
+
+	// width, color, styleのうち一つでも指定があれば、枠線がちゃんと表示されるようにwidthとstyleのデフォルト値を設定
+	// radiusは単に角を丸める用途もあるため除外
+	const isBordered = c.borderWidth ?? c.borderColor ?? c.borderStyle;
+
+	const border = isBordered ? {
+		borderWidth: c.borderWidth ?? '1px',
+		borderColor: c.borderColor ?? 'var(--divider)',
+		borderStyle: c.borderStyle ?? 'solid',
+	} : undefined;
+
+	return {
+		textAlign: c.align,
+		backgroundColor: c.bgColor,
+		color: c.fgColor,
+		padding: c.padding ? `${c.padding}px` : 0,
+		borderRadius: (c.borderRadius ?? (c.rounded ? 8 : 0)) + 'px',
+		...border,
+	};
+});
+
 const valueForSwitch = ref('default' in c && typeof c.default === 'boolean' ? c.default : false);
 
 function onSwitchUpdate(v) {
diff --git a/packages/frontend/src/scripts/aiscript/ui.ts b/packages/frontend/src/scripts/aiscript/ui.ts
index fa3fcac2e7..2b386bebb8 100644
--- a/packages/frontend/src/scripts/aiscript/ui.ts
+++ b/packages/frontend/src/scripts/aiscript/ui.ts
@@ -27,6 +27,8 @@ export type AsUiContainer = AsUiComponentBase & {
 	font?: 'serif' | 'sans-serif' | 'monospace';
 	borderWidth?: number;
 	borderColor?: string;
+	borderStyle?: 'hidden' | 'dotted' | 'dashed' | 'solid' | 'double' | 'groove' | 'ridge' | 'inset' | 'outset';
+	borderRadius?: number;
 	padding?: number;
 	rounded?: boolean;
 	hidden?: boolean;
@@ -173,6 +175,10 @@ function getContainerOptions(def: values.Value | undefined): Omit<AsUiContainer,
 	if (borderWidth) utils.assertNumber(borderWidth);
 	const borderColor = def.value.get('borderColor');
 	if (borderColor) utils.assertString(borderColor);
+	const borderStyle = def.value.get('borderStyle');
+	if (borderStyle) utils.assertString(borderStyle);
+	const borderRadius = def.value.get('borderRadius');
+	if (borderRadius) utils.assertNumber(borderRadius);
 	const padding = def.value.get('padding');
 	if (padding) utils.assertNumber(padding);
 	const rounded = def.value.get('rounded');
@@ -191,6 +197,8 @@ function getContainerOptions(def: values.Value | undefined): Omit<AsUiContainer,
 		font: font?.value,
 		borderWidth: borderWidth?.value,
 		borderColor: borderColor?.value,
+		borderStyle: borderStyle?.value,
+		borderRadius: borderRadius?.value,
 		padding: padding?.value,
 		rounded: rounded?.value,
 		hidden: hidden?.value,