diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 06b53f26a0..e87a1af90e 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -556,6 +556,12 @@ testEmail: "配信テスト"
 wordMute: "ワードミュート"
 userSaysSomething: "{name}が何かを言いました"
 makeActive: "アクティブにする"
+display: "表示"
+
+_sidebar:
+  full: "フル"
+  icon: "アイコン"
+  hide: "隠す"
 
 _wordMute:
   muteWords: "ミュートするワード"
diff --git a/src/client/app.vue b/src/client/app.vue
index dcd393db32..32777e21b1 100644
--- a/src/client/app.vue
+++ b/src/client/app.vue
@@ -1,6 +1,6 @@
 <template>
 <div class="mk-app" v-hotkey.global="keymap">
-	<header class="header">
+	<header class="header" ref="header">
 		<div class="title" ref="title">
 			<transition :name="$store.state.device.animation ? 'header' : ''" mode="out-in" appear>
 				<button class="_button back" v-if="canBack" @click="back()"><fa :icon="faChevronLeft"/></button>
@@ -31,7 +31,7 @@
 		</div>
 	</header>
 
-	<x-sidebar ref="nav"/>
+	<x-sidebar ref="nav" @change-view-mode="calcHeaderWidth"/>
 
 	<div class="contents" ref="contents" :class="{ wallpaper }">
 		<main ref="main">
@@ -77,7 +77,7 @@
 		</template>
 	</div>
 
-	<div class="buttons">
+	<div class="buttons" :class="{ navHidden }">
 		<button class="button nav _button" @click="showNav" ref="navButton"><fa :icon="faBars"/><i v-if="navIndicated"><fa :icon="faCircle"/></i></button>
 		<button v-if="$route.name === 'index'" class="button home _button" @click="top()"><fa :icon="faHome"/></button>
 		<button v-else class="button home _button" @click="$router.push('/')"><fa :icon="faHome"/></button>
@@ -85,7 +85,7 @@
 		<button v-if="$store.getters.isSignedIn" class="button post _buttonPrimary" @click="post()"><fa :icon="faPencilAlt"/></button>
 	</div>
 
-	<button v-if="$store.getters.isSignedIn" class="post _buttonPrimary" @click="post()"><fa :icon="faPencilAlt"/></button>
+	<button v-if="$store.getters.isSignedIn" class="post _buttonPrimary" :class="{ navHidden }" @click="post()"><fa :icon="faPencilAlt"/></button>
 
 	<stream-indicator v-if="$store.getters.isSignedIn"/>
 </div>
@@ -124,6 +124,7 @@ export default Vue.extend({
 			isDesktop: window.innerWidth >= DESKTOP_THRESHOLD,
 			canBack: false,
 			menuDef: this.$store.getters.nav({}),
+			navHidden: false,
 			wallpaper: localStorage.getItem('wallpaper') != null,
 			faGripVertical, faChevronLeft, faComments, faHashtag, faBroadcastTower, faFireAlt, faEllipsisH, faPencilAlt, faBars, faTimes, faBell, faSearch, faUserCog, faCog, faUser, faHome, faStar, faCircle, faAt, faEnvelope, faListUl, faPlus, faUserClock, faLaugh, faUsers, faTachometerAlt, faExchangeAlt, faGlobe, faChartBar, faCloud, faServer, faProjectDiagram
 		};
@@ -225,22 +226,15 @@ export default Vue.extend({
 	},
 
 	mounted() {
-		const adjustTitlePosition = () => {
-			const left = this.$refs.main.getBoundingClientRect().left - this.$refs.nav.$el.offsetWidth;
-			if (left >= 0) {
-				this.$refs.title.style.left = left + 'px';
-			}
-		};
-
-		adjustTitlePosition();
+		this.adjustTitlePosition();
 
 		const ro = new ResizeObserver((entries, observer) => {
-			adjustTitlePosition();
+			this.adjustTitlePosition();
 		});
 
 		ro.observe(this.$refs.contents);
 
-		window.addEventListener('resize', adjustTitlePosition, { passive: true });
+		window.addEventListener('resize', this.adjustTitlePosition, { passive: true });
 
 		if (!this.isDesktop) {
 			window.addEventListener('resize', () => {
@@ -250,9 +244,27 @@ export default Vue.extend({
 
 		// widget follow
 		this.attachSticky();
+
+		this.$nextTick(() => {
+			this.calcHeaderWidth();
+		});
 	},
 
 	methods: {
+		adjustTitlePosition() {
+			const left = this.$refs.main.getBoundingClientRect().left - this.$refs.nav.$el.offsetWidth;
+			if (left >= 0) {
+				this.$refs.title.style.left = left + 'px';
+			}
+		},
+
+		calcHeaderWidth() {
+			const navWidth = this.$refs.nav.$el.offsetWidth;
+			this.navHidden = navWidth === 0;
+			this.$refs.header.style.width = `calc(100% - ${navWidth}px)`;
+			this.adjustTitlePosition();
+		},
+
 		showNav() {
 			this.$refs.nav.show();
 		},
@@ -373,12 +385,8 @@ export default Vue.extend({
 <style lang="scss" scoped>
 .mk-app {
 	$header-height: 60px;
-	$nav-width: 250px; // TODO: どこかに集約したい
-	$nav-icon-only-width: 80px; // TODO: どこかに集約したい
 	$main-width: 670px;
 	$ui-font-size: 1em; // TODO: どこかに集約したい
-	$nav-icon-only-threshold: 1279px; // TODO: どこかに集約したい
-	$nav-hide-threshold: 650px; // TODO: どこかに集約したい
 	$header-sub-hide-threshold: 1090px;
 	$left-widgets-hide-threshold: 1600px;
 	$right-widgets-hide-threshold: 1090px;
@@ -399,21 +407,13 @@ export default Vue.extend({
 		top: 0;
 		right: 0;
 		height: $header-height;
-		width: calc(100% - #{$nav-width});
+		width: 100%;
 		//background-color: var(--panel);
 		-webkit-backdrop-filter: blur(32px);
 		backdrop-filter: blur(32px);
 		background-color: var(--header);
 		border-bottom: solid 1px var(--divider);
 
-		@media (max-width: $nav-icon-only-threshold) {
-			width: calc(100% - #{$nav-icon-only-width});
-		}
-
-		@media (max-width: $nav-hide-threshold) {
-			width: 100%;
-		}
-
 		> .title {
 			position: relative;
 			line-height: $header-height;
@@ -683,7 +683,7 @@ export default Vue.extend({
 	}
 
 	> .post {
-		display: none;
+		display: block;
 		position: fixed;
 		z-index: 1000;
 		bottom: 32px;
@@ -694,8 +694,8 @@ export default Vue.extend({
 		box-shadow: 0 3px 5px -1px rgba(0, 0, 0, 0.2), 0 6px 10px 0 rgba(0, 0, 0, 0.14), 0 1px 18px 0 rgba(0, 0, 0, 0.12);
 		font-size: 22px;
 
-		@media (min-width: ($nav-hide-threshold + 1px)) {
-			display: block;
+		&.navHidden {
+			display: none;
 		}
 
 		@media (min-width: ($header-sub-hide-threshold + 1px)) {
@@ -717,7 +717,7 @@ export default Vue.extend({
 			padding: 0 16px 16px 16px;
 		}
 
-		@media (min-width: ($nav-hide-threshold + 1px)) {
+		&:not(.navHidden) {
 			display: none;
 		}
 
diff --git a/src/client/components/sidebar.vue b/src/client/components/sidebar.vue
index 558087f1d8..d64112c52e 100644
--- a/src/client/components/sidebar.vue
+++ b/src/client/components/sidebar.vue
@@ -9,7 +9,7 @@
 	</transition>
 
 	<transition name="nav">
-		<nav class="nav" v-show="showing">
+		<nav class="nav" :class="{ iconOnly, hidden }" v-show="showing">
 			<div>
 				<button class="item _button account" @click="openAccountMenu" v-if="$store.getters.isSignedIn">
 					<mk-avatar :user="$store.state.i" class="avatar"/><mk-acct class="text" :user="$store.state.i"/>
@@ -62,6 +62,8 @@ export default Vue.extend({
 			menuDef: this.$store.getters.nav({
 				search: this.search
 			}),
+			iconOnly: false,
+			hidden: false,
 			faGripVertical, faChevronLeft, faComments, faHashtag, faBroadcastTower, faFireAlt, faEllipsisH, faPencilAlt, faBars, faTimes, faBell, faSearch, faUserCog, faCog, faUser, faHome, faStar, faCircle, faAt, faEnvelope, faListUl, faPlus, faUserClock, faLaugh, faUsers, faTachometerAlt, faExchangeAlt, faGlobe, faChartBar, faCloud, faServer, faProjectDiagram
 		};
 	},
@@ -85,9 +87,35 @@ export default Vue.extend({
 		$route(to, from) {
 			this.showing = false;
 		},
+
+		'$store.state.device.sidebarDisplay'() {
+			this.calcViewState();
+		},
+
+		iconOnly() {
+			this.$nextTick(() => {
+				this.$emit('change-view-mode');
+			});
+		},
+
+		hidden() {
+			this.$nextTick(() => {
+				this.$emit('change-view-mode');
+			});
+		}
+	},
+
+	created() {
+		window.addEventListener('resize', this.calcViewState);
+		this.calcViewState();
 	},
 
 	methods: {
+		calcViewState() {
+			this.iconOnly = (window.innerWidth <= 1279) || (this.$store.state.device.sidebarDisplay === 'icon');
+			this.hidden = (window.innerWidth <= 650) || (this.$store.state.device.sidebarDisplay === 'hide');
+		},
+
 		show() {
 			this.showing = true;
 		},
@@ -314,10 +342,8 @@ export default Vue.extend({
 
 .mvcprjjd {
 	$ui-font-size: 1em; // TODO: どこかに集約したい
-	$nav-width: 250px; // TODO: どこかに集約したい
-	$nav-icon-only-width: 80px; // TODO: どこかに集約したい
-	$nav-icon-only-threshold: 1279px; // TODO: どこかに集約したい
-	$nav-hide-threshold: 650px; // TODO: どこかに集約したい
+	$nav-width: 250px;
+	$nav-icon-only-width: 80px;
 
 	> .nav-back {
 		z-index: 1001;
@@ -331,19 +357,66 @@ export default Vue.extend({
 		width: $nav-width;
 		box-sizing: border-box;
 
-		@media (max-width: $nav-icon-only-threshold) {
+		&.iconOnly {
 			flex: 0 0 $nav-icon-only-width;
 			width: $nav-icon-only-width;
+
+			&:not(.hidden) {
+				> div {
+					width: $nav-icon-only-width;
+
+					> .divider {
+						margin: 8px auto;
+						width: calc(100% - 32px);
+					}
+
+					> .item {
+						padding-left: 0;
+						width: 100%;
+						text-align: center;
+						font-size: $ui-font-size * 1.2;
+						line-height: 3.7rem;
+
+						> [data-icon],
+						> .avatar {
+							margin-right: 0;
+						}
+
+						> i {
+							left: 10px;
+						}
+
+						> .text {
+							display: none;
+						}
+
+						&:first-child {
+							margin-bottom: 8px;
+						}
+
+						&:last-child {
+							margin-top: 8px;
+						}
+					}
+				}
+			}
 		}
 
-		@media (max-width: $nav-hide-threshold) {
+		&.hidden {
 			position: fixed;
 			top: 0;
 			left: 0;
 			z-index: 1001;
+
+			> div {
+				> .index,
+				> .notifications {
+					display: none;
+				}
+			}
 		}
 
-		@media (min-width: $nav-hide-threshold + 1px) {
+		&:not(.hidden) {
 			display: block !important;
 		}
 
@@ -365,25 +438,6 @@ export default Vue.extend({
 				border-top: solid 1px var(--divider);
 			}
 
-			@media (max-width: $nav-icon-only-threshold) and (min-width: $nav-hide-threshold + 1px) {
-				width: $nav-icon-only-width;
-
-				> .divider {
-					margin: 8px auto;
-					width: calc(100% - 32px);
-				}
-
-				> .item {
-					&:first-child {
-						margin-bottom: 8px;
-					}
-
-					&:last-child {
-						margin-top: 8px;
-					}
-				}
-			}
-
 			> .item {
 				position: relative;
 				display: block;
@@ -452,34 +506,6 @@ export default Vue.extend({
 					margin-top: 16px;
 					border-top: solid 1px var(--divider);
 				}
-
-				@media (max-width: $nav-icon-only-threshold) and (min-width: $nav-hide-threshold + 1px) {
-					padding-left: 0;
-					width: 100%;
-					text-align: center;
-					font-size: $ui-font-size * 1.2;
-					line-height: 3.7rem;
-
-					> [data-icon],
-					> .avatar {
-						margin-right: 0;
-					}
-
-					> i {
-						left: 10px;
-					}
-
-					> .text {
-						display: none;
-					}
-				}
-			}
-
-			@media (max-width: $nav-hide-threshold) {
-				> .index,
-				> .notifications {
-					display: none;
-				}
 			}
 		}
 	}
diff --git a/src/client/components/ui/radio.vue b/src/client/components/ui/radio.vue
index 0b0fad6773..311cdce32d 100644
--- a/src/client/components/ui/radio.vue
+++ b/src/client/components/ui/radio.vue
@@ -42,6 +42,7 @@ export default Vue.extend({
 	},
 	methods: {
 		toggle() {
+			if (this.disabled) return;
 			this.$emit('change', this.value);
 		}
 	}
@@ -61,7 +62,10 @@ export default Vue.extend({
 
 	&.disabled {
 		opacity: 0.6;
-		cursor: not-allowed;
+
+		&, * {
+			cursor: not-allowed !important;
+		}
 	}
 
 	&.checked {
diff --git a/src/client/pages/preferences/sidebar.vue b/src/client/pages/preferences/sidebar.vue
index 34c9916cf5..10aad0f3a0 100644
--- a/src/client/pages/preferences/sidebar.vue
+++ b/src/client/pages/preferences/sidebar.vue
@@ -7,6 +7,12 @@
 			<template #desc><button class="_textButton" @click="addItem">{{ $t('addItem') }}</button></template>
 		</mk-textarea>
 	</div>
+	<div class="_content">
+		<div>{{ $t('display') }}</div>
+		<mk-radio v-model="sidebarDisplay" value="full">{{ $t('_sidebar.full') }}</mk-radio>
+		<mk-radio v-model="sidebarDisplay" value="icon">{{ $t('_sidebar.icon') }}</mk-radio>
+		<!-- <mk-radio v-model="sidebarDisplay" value="hide" disabled>{{ $t('_sidebar.hide') }}</mk-radio>--> <!-- TODO: サイドバーを完全に隠せるようにすると、別途ハンバーガーボタンのようなものをUIに表示する必要があり面倒 -->
+	</div>
 	<div class="_footer">
 		<mk-button inline @click="save()" primary><fa :icon="faSave"/> {{ $t('save') }}</mk-button>
 		<mk-button inline @click="reset()"><fa :icon="faRedo"/> {{ $t('default') }}</mk-button>
@@ -19,12 +25,14 @@ import Vue from 'vue';
 import { faListUl, faSave, faRedo } from '@fortawesome/free-solid-svg-icons';
 import MkButton from '../../components/ui/button.vue';
 import MkTextarea from '../../components/ui/textarea.vue';
+import MkRadio from '../../components/ui/radio.vue';
 import { defaultDeviceUserSettings } from '../../store';
 
 export default Vue.extend({
 	components: {
 		MkButton,
 		MkTextarea,
+		MkRadio,
 	},
 	
 	data() {
@@ -38,7 +46,12 @@ export default Vue.extend({
 	computed: {
 		splited(): string[] {
 			return this.items.trim().split('\n').filter(x => x.trim() !== '');
-		}
+		},
+
+		sidebarDisplay: {
+			get() { return this.$store.state.device.sidebarDisplay; },
+			set(value) { this.$store.commit('device/set', { key: 'sidebarDisplay', value }); }
+		},
 	},
 
 	created() {
diff --git a/src/client/store.ts b/src/client/store.ts
index 0bf4520487..93a28182d2 100644
--- a/src/client/store.ts
+++ b/src/client/store.ts
@@ -77,6 +77,7 @@ export const defaultDeviceSettings = {
 	enableInfiniteScroll: true,
 	fixedWidgetsPosition: false,
 	useBlurEffectForModal: true,
+	sidebarDisplay: 'full', // full, icon, hide
 	roomGraphicsQuality: 'medium',
 	roomUseOrthographicCamera: true,
 	deckColumnAlign: 'left',