diff --git a/packages/frontend/src/components/MkImageGallery.item.vue b/packages/frontend/src/components/MkImageGallery.item.vue
index 4e5e515f64..741968a7ae 100644
--- a/packages/frontend/src/components/MkImageGallery.item.vue
+++ b/packages/frontend/src/components/MkImageGallery.item.vue
@@ -4,21 +4,26 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div ref="rootEl" :class="$style.root" :style="{ transform: `translate3d(${translation.x}px, ${translation.y}px, 0)` }">
-	<img
-		ref="imageEl"
-		:class="$style.image"
-		:src="image.src"
-		:width="size.width"
-		:height="size.height"
-		draggable="false"
-		@wheel="onWheel"
-		@pointerdown="onPointerdown"
-		@pointermove="onPointermove"
-		@pointerup="onPointerup"
-		@touchstart="onTouchstart"
-		@touchmove="onTouchmove"
-	>
+<div
+	ref="rootEl"
+	:class="$style.root"
+	@pointerdown="onPointerdown"
+	@pointermove="onPointermove"
+	@pointerup="onPointerup"
+	@touchstart="onTouchstart"
+	@touchmove="onTouchmove"
+>
+	<div :style="{ transform: `translate3d(${translation.x}px, ${translation.y}px, 0)` }">
+		<img
+			ref="imageEl"
+			:class="$style.image"
+			:src="image.src"
+			:width="size.width"
+			:height="size.height"
+			draggable="false"
+			@wheel="onWheel"
+		>
+	</div>
 </div>
 </template>
 
@@ -43,6 +48,10 @@ const props = withDefaults(defineProps<{
 
 const emit = defineEmits<{
 	(ev: 'close'): void;
+	(ev: 'horizontalSwipe', offset: number): void;
+	(ev: 'next'): void;
+	(ev: 'prev'): void;
+	(ev: 'cancelHorizontalSwipe'): void;
 }>();
 
 const rootEl = useTemplateRef('rootEl');
@@ -193,6 +202,7 @@ let currentPointerStartOffset = { x: 0, y: 0 };
 let isVerticalSwiping = false;
 let isHorizontalSwiping = false;
 let verticalSwipeDelta = 0;
+let horizontalSwipeDelta = 0;
 
 const pointerEventCache = new Map<number, PointerEvent>();
 let pointerVec = { x: 0, y: 0 };
@@ -256,7 +266,9 @@ function onPointermove(ev: PointerEvent) {
 				translation.value.y += deltaY;
 				verticalSwipeDelta += deltaY;
 			} else if (isHorizontalSwiping) {
-				translation.value.x += deltaX;
+				//translation.value.x += deltaX;
+				horizontalSwipeDelta += deltaX;
+				emit('horizontalSwipe', currentPointerStartOffset.x - ev.clientX);
 			} else {
 				const isVerticalVector = Math.abs(deltaY) > Math.abs(deltaX);
 				if (isVerticalVector) {
@@ -285,8 +297,8 @@ function onPointerup(ev: PointerEvent) {
 		currentPointerId = null;
 
 		if (isVerticalSwiping) {
-			const shouldCloseByUpwardSwipe = verticalSwipeDelta < -200 || pointerVec.y < -3; // 上の方で離された、または上に向かって強めに弾かれた
-			const shouldCloseByDownwardSwipe = verticalSwipeDelta > 200 || pointerVec.y > 3; // 下の方で離された、または下に向かって強めに弾かれた
+			const shouldCloseByUpwardSwipe = verticalSwipeDelta < -200 || (verticalSwipeDelta < 0 && pointerVec.y < -3); // 上の方で離された、または上に向かって強めに弾かれた
+			const shouldCloseByDownwardSwipe = verticalSwipeDelta > 200 || (verticalSwipeDelta > 0 && pointerVec.y > 3); // 下の方で離された、または下に向かって強めに弾かれた
 			if (shouldCloseByUpwardSwipe || shouldCloseByDownwardSwipe) {
 				emit('close');
 				return;
@@ -298,6 +310,16 @@ function onPointerup(ev: PointerEvent) {
 				x: defaultTranslation.x,
 				y: defaultTranslation.y,
 			}, ANIMATION_DURATION);
+		} else if (isHorizontalSwiping) {
+			const shouldNext = horizontalSwipeDelta < -200 || (horizontalSwipeDelta < 0 && pointerVec.x < -3); // 左の方で離された、または左に向かって強めに弾かれた
+			const shouldPrev = horizontalSwipeDelta > 200 || (horizontalSwipeDelta > 0 && pointerVec.x > 3); // 右の方で離された、または右に向かって強めに弾かれた
+			if (shouldNext) {
+				emit('next');
+			} else if (shouldPrev) {
+				emit('prev');
+			} else {
+				emit('cancelHorizontalSwipe');
+			}
 		}
 	}
 	isVerticalSwiping = false;
@@ -366,14 +388,15 @@ onBeforeUnmount(() => {
 
 <style lang="scss" module>
 .root {
-	//transition: transform 0.2s ease;
+	position: absolute;
 	touch-action: none;
+	width: 100%;
+	height: 100%;
 }
 
 .image {
 	display: block;
 	-webkit-touch-callout: none;
 	user-select: none;
-	//transition: width 0.2s ease, height 0.2s ease;
 }
 </style>
diff --git a/packages/frontend/src/components/MkImageGallery.vue b/packages/frontend/src/components/MkImageGallery.vue
index edfde2215b..29b67d9c3e 100644
--- a/packages/frontend/src/components/MkImageGallery.vue
+++ b/packages/frontend/src/components/MkImageGallery.vue
@@ -7,9 +7,16 @@ SPDX-License-Identifier: AGPL-3.0-only
 <div ref="rootEl" :class="$style.root" :style="{ zIndex }">
 	<div :class="[$style.bg]"></div>
 	<div ref="mainEl" :class="$style.main">
-		<div :class="$style.items">
-			<div v-for="image in images" :key="image.src" :class="$style.item">
-				<XItem :image="image" @close="onItemClose"/>
+		<div ref="itemsEl" :class="$style.items">
+			<div v-for="image in images" :key="image.src" ref="itemEl" :class="$style.item">
+				<XItem
+					:image="image"
+					@close="onItemClose"
+					@horizontalSwipe="onHorizontalSwipe"
+					@prev="onPrev"
+					@next="onNext"
+					@cancelHorizontalSwipe="onCancelHorizontalSwipe"
+				/>
 			</div>
 		</div>
 	</div>
@@ -31,7 +38,7 @@ type Image = {
 };
 
 const props = withDefaults(defineProps<{
-	defaultId?: string;
+	defaultIndex?: number;
 	images: Image[];
 }>(), {
 });
@@ -42,8 +49,48 @@ const emit = defineEmits<{
 
 const rootEl = useTemplateRef('rootEl');
 const mainEl = useTemplateRef('mainEl');
+const itemsEl = useTemplateRef('itemsEl');
+const itemEl = useTemplateRef('itemEl');
 const zIndex = os.claimZIndex('high');
 
+let currentScrollLeft = 0;
+let currentIndex = props.defaultIndex ?? 0;
+
+function onHorizontalSwipe(offset: number) {
+	itemsEl.value.scrollLeft = currentScrollLeft + offset;
+}
+
+function onCancelHorizontalSwipe() {
+	itemsEl.value.scrollTo({
+		left: currentScrollLeft,
+		behavior: 'smooth',
+	});
+}
+
+function onNext() {
+	if (currentIndex < props.images.length - 1) {
+		currentIndex++;
+		const el = itemEl.value[currentIndex];
+		currentScrollLeft = el.offsetLeft;
+		itemsEl.value.scrollTo({
+			left: currentScrollLeft,
+			behavior: 'smooth',
+		});
+	}
+}
+
+function onPrev() {
+	if (currentIndex > 0) {
+		currentIndex--;
+		const el = itemEl.value[currentIndex];
+		currentScrollLeft = el.offsetLeft;
+		itemsEl.value.scrollTo({
+			left: currentScrollLeft,
+			behavior: 'smooth',
+		});
+	}
+}
+
 function onItemClose() {
 	emit('closed');
 }
@@ -76,8 +123,7 @@ function onItemClose() {
 	display: flex;
 	width: 100dvw;
 	height: 100dvh;
-	overflow-x: auto;
-	overflow-y: clip;
+	overflow: hidden;
 	scrollbar-width: none;
 }
 
diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index 64264d01e4..c5e83db03f 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -94,15 +94,16 @@ const previewable = (file: Misskey.entities.DriveFile): boolean => {
 };
 
 async function openGallery(id: string) {
+	const images = props.mediaList.filter(media => previewable(media)).map(media => ({
+		id: media.id,
+		src: media.url,
+		width: media.properties.width ?? 0,
+		height: media.properties.height ?? 0,
+		sourceElement: gallery.value?.querySelector(`.image[data-id="${media.id}"]`) as HTMLElement | undefined,
+	}));
 	const { dispose } = await os.popupAsyncWithDialog(import('@/components/MkImageGallery.vue').then(x => x.default), {
-		defaultId: id,
-		images: props.mediaList.filter(media => previewable(media)).map(media => ({
-			id: media.id,
-			src: media.url,
-			width: media.properties.width ?? 0,
-			height: media.properties.height ?? 0,
-			sourceElement: gallery.value?.querySelector(`.image[data-id="${media.id}"]`) as HTMLElement | undefined,
-		})),
+		defaultIndex: images.findIndex(image => image.id === id),
+		images: images,
 	}, {
 		closed: () => dispose(),
 	});