diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 013a85dff9..aa8e2bd160 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -995,6 +995,7 @@ _widgets:
   digitalClock: "デジタル時計"
   federation: "連合"
   postForm: "投稿フォーム"
+  slideshow: "スライドショー"
 
 _cw:
   hide: "隠す"
diff --git a/src/client/widgets/index.ts b/src/client/widgets/index.ts
index ee76bd97d2..c8bee90e4f 100644
--- a/src/client/widgets/index.ts
+++ b/src/client/widgets/index.ts
@@ -13,6 +13,7 @@ export default function(app: App) {
 	app.component('MkwDigitalClock', defineAsyncComponent(() => import('./digital-clock.vue')));
 	app.component('MkwFederation', defineAsyncComponent(() => import('./federation.vue')));
 	app.component('MkwPostForm', defineAsyncComponent(() => import('./post-form.vue')));
+	app.component('MkwSlideshow', defineAsyncComponent(() => import('./slideshow.vue')));
 }
 
 export const widgets = [
@@ -28,4 +29,5 @@ export const widgets = [
 	'digitalClock',
 	'federation',
 	'postForm',
+	'slideshow',
 ];
diff --git a/src/client/widgets/slideshow.vue b/src/client/widgets/slideshow.vue
new file mode 100644
index 0000000000..0c1a2dc863
--- /dev/null
+++ b/src/client/widgets/slideshow.vue
@@ -0,0 +1,168 @@
+<template>
+<div class="kvausudm _panel">
+	<div @click="choose">
+		<p v-if="props.folderId == null">
+			<template v-if="isCustomizeMode">{{ $t('folder-customize-mode') }}</template>
+			<template v-else>{{ $t('folder') }}</template>
+		</p>
+		<p v-if="props.folderId != null && images.length === 0 && !fetching">{{ $t('no-image') }}</p>
+		<div ref="slideA" class="slide a"></div>
+		<div ref="slideB" class="slide b"></div>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+import {  } from '@fortawesome/free-solid-svg-icons';
+import define from './define';
+import * as os from '@/os';
+
+const widget = define({
+	name: 'slideshow',
+	props: () => ({
+		height: {
+			type: 'number',
+			default: 300,
+		},
+		folderId: {
+			type: 'string',
+			default: null,
+			hidden: true,
+		},
+	})
+});
+
+export default defineComponent({
+	extends: widget,
+	data() {
+		return {
+			images: [],
+			fetching: true,
+			clock: null
+		};
+	},
+	mounted() {
+		this.$nextTick(() => {
+			this.applySize();
+		});
+
+		if (this.props.folderId != null) {
+			this.fetch();
+		}
+
+		this.clock = setInterval(this.change, 10000);
+	},
+	beforeUnmount() {
+		clearInterval(this.clock);
+	},
+	methods: {
+		applySize() {
+			let h;
+
+			if (this.props.size == 1) {
+				h = 250;
+			} else {
+				h = 170;
+			}
+
+			this.$el.style.height = `${h}px`;
+		},
+		resize() {
+			if (this.props.size == 1) {
+				this.props.size = 0;
+			} else {
+				this.props.size++;
+			}
+			this.save();
+
+			this.applySize();
+		},
+		change() {
+			if (this.images.length == 0) return;
+
+			const index = Math.floor(Math.random() * this.images.length);
+			const img = `url(${ this.images[index].url })`;
+
+			(this.$refs.slideB as any).style.backgroundImage = img;
+
+			this.$refs.slideB.classList.add('anime');
+			setTimeout(() => {
+				// 既にこのウィジェットがunmountされていたら要素がない
+				if ((this.$refs.slideA as any) == null) return;
+
+				(this.$refs.slideA as any).style.backgroundImage = img;
+
+				this.$refs.slideB.classList.remove('anime');
+			}, 1000);
+		},
+		fetch() {
+			this.fetching = true;
+
+			os.api('drive/files', {
+				folderId: this.props.folderId,
+				type: 'image/*',
+				limit: 100
+			}).then(images => {
+				this.images = images;
+				this.fetching = false;
+				(this.$refs.slideA as any).style.backgroundImage = '';
+				(this.$refs.slideB as any).style.backgroundImage = '';
+				this.change();
+			});
+		},
+		choose() {
+			os.selectDriveFolder(false).then(folder => {
+				if (folder == null) {
+					return;
+				}
+				this.props.folderId = folder.id;
+				this.save();
+				this.fetch();
+			});
+		}
+	}
+});
+</script>
+
+<style lang="scss" scoped>
+.kvausudm {
+	position: relative;
+
+	> div {
+		width: 100%;
+		height: 100%;
+		cursor: pointer;
+
+		> p {
+			display: block;
+			margin: 1em;
+			text-align: center;
+			color: #888;
+		}
+
+		> * {
+			pointer-events: none;
+		}
+
+		> .slide {
+			position: absolute;
+			top: 0;
+			left: 0;
+			width: 100%;
+			height: 100%;
+			background-size: cover;
+			background-position: center;
+
+			&.b {
+				opacity: 0;
+			}
+
+			&.anime {
+				transition: opacity 1s;
+				opacity: 1;
+			}
+		}
+	}
+}
+</style>