diff --git a/packages/frontend/src/components/global/MkPageHeader.tabs.vue b/packages/frontend/src/components/global/MkPageHeader.tabs.vue
index 9b19c5dc8..dae68c7e9 100644
--- a/packages/frontend/src/components/global/MkPageHeader.tabs.vue
+++ b/packages/frontend/src/components/global/MkPageHeader.tabs.vue
@@ -10,7 +10,7 @@
 						:class="$style.tabTitle">{{ t.title }}</div>
 					<Transition v-else @enter="enter" @after-enter="afterEnter" @leave="leave" @after-leave="afterLeave"
 						mode="in-out">
-						<div v-if="t.key === tab" :class="$style.tabTitle">{{ t.title }}</div>
+						<div v-show="t.key === tab" :class="[$style.tabTitle, $style.animate]">{{ t.title }}</div>
 					</Transition>
 				</div>
 			</button>
@@ -34,7 +34,7 @@ export type Tab = {
 </script>
 
 <script lang="ts" setup>
-import { onMounted, onUnmounted, watch, nextTick } from 'vue';
+import { onMounted, onUnmounted, watch, nextTick, Transition, shallowRef } from 'vue';
 import { defaultStore } from '@/store';
 
 const props = withDefaults(defineProps<{
@@ -50,9 +50,9 @@ const emit = defineEmits<{
 	(ev: 'tabClick', key: string);
 }>();
 
-let el = $shallowRef<HTMLElement | null>(null);
+const el = shallowRef<HTMLElement | null>(null);
 const tabRefs: Record<string, HTMLElement | null> = {};
-let tabHighlightEl = $shallowRef<HTMLElement | null>(null);
+const tabHighlightEl = shallowRef<HTMLElement | null>(null);
 
 function onTabMousedown(tab: Tab, ev: MouseEvent): void {
 	// ユーザビリティの観点からmousedown時にはonClickは呼ばない
@@ -77,13 +77,13 @@ function onTabClick(t: Tab, ev: MouseEvent): void {
 
 function renderTab() {
 	const tabEl = props.tab ? tabRefs[props.tab] : undefined;
-	if (tabEl && tabHighlightEl && tabHighlightEl.parentElement) {
+	if (tabEl && tabHighlightEl.value && tabHighlightEl.value.parentElement) {
 		// offsetWidth や offsetLeft は少数を丸めてしまうため getBoundingClientRect を使う必要がある
 		// https://developer.mozilla.org/ja/docs/Web/API/HTMLElement/offsetWidth#%E5%80%A4
-		const parentRect = tabHighlightEl.parentElement.getBoundingClientRect();
+		const parentRect = tabHighlightEl.value.parentElement.getBoundingClientRect();
 		const rect = tabEl.getBoundingClientRect();
-		tabHighlightEl.style.width = rect.width + 'px';
-		tabHighlightEl.style.left = (rect.left - parentRect.left + tabHighlightEl.parentElement.scrollLeft) + 'px';
+		tabHighlightEl.value.style.width = rect.width + 'px';
+		tabHighlightEl.value.style.left = (rect.left - parentRect.left + tabHighlightEl.value.parentElement.scrollLeft) + 'px';
 	}
 }
 
@@ -99,22 +99,32 @@ function onTabWheel(ev: WheelEvent) {
 	return false;
 }
 
-function enter(el: HTMLElement) {
+let entering = false;
+
+async function enter(el: HTMLElement) {
+	entering = true;
 	const elementWidth = el.getBoundingClientRect().width;
 	el.style.width = '0';
-	el.offsetWidth; // reflow
+	el.style.paddingLeft = '0';
+	el.offsetWidth; // force reflow
 	el.style.width = elementWidth + 'px';
-	setTimeout(renderTab, 70);
+	el.style.paddingLeft = '';
+	nextTick(() => {
+		entering = false;
+	});
+
+	setTimeout(renderTab, 170);
 }
 function afterEnter(el: HTMLElement) {
-	el.style.width = '';
-	nextTick(renderTab);
+	//el.style.width = '';
 }
-function leave(el: HTMLElement) {
+async function leave(el: HTMLElement) {
 	const elementWidth = el.getBoundingClientRect().width;
 	el.style.width = elementWidth + 'px';
-	el.offsetWidth; // reflow
+	el.style.paddingLeft = '';
+	el.offsetWidth; // force reflow
 	el.style.width = '0';
+	el.style.paddingLeft = '0';
 }
 function afterLeave(el: HTMLElement) {
 	el.style.width = '';
@@ -124,14 +134,17 @@ let ro2: ResizeObserver | null;
 
 onMounted(() => {
 	watch([() => props.tab, () => props.tabs], () => {
-		nextTick(() => renderTab());
+		nextTick(() => {
+			if (entering) return;
+			renderTab();
+		});
 	}, {
 		immediate: true,
 	});
 
 	if (props.rootEl) {
 		ro2 = new ResizeObserver((entries, observer) => {
-			if (document.body.contains(el as HTMLElement)) {
+			if (document.body.contains(el.value as HTMLElement)) {
 				nextTick(() => renderTab());
 			}
 		});
@@ -194,12 +207,15 @@ onUnmounted(() => {
 }
 
 .tabIcon+.tabTitle {
-	margin-left: 8px;
+	padding-left: 8px;
 }
 
 .tabTitle {
 	overflow: hidden;
-	transition: width 0.15s ease-in-out;
+
+	&.animate {
+		transition: width .15s linear, padding-left .15s linear;
+	}
 }
 
 .tabHighlight {
diff --git a/packages/frontend/src/components/global/MkPageHeader.vue b/packages/frontend/src/components/global/MkPageHeader.vue
index d39fcde1b..803efb169 100644
--- a/packages/frontend/src/components/global/MkPageHeader.vue
+++ b/packages/frontend/src/components/global/MkPageHeader.vue
@@ -1,10 +1,10 @@
 <template>
 <div v-if="show" ref="el" :class="[$style.root]" :style="{ background: bg }">
 	<div :class="[$style.upper, { [$style.slim]: narrow, [$style.thin]: thin_ }]">
-		<div v-if="narrow && props.displayMyAvatar && $i" class="_button" :class="$style.buttonsLeft" @click="openAccountMenu">
+		<div v-if="!thin_ && narrow && props.displayMyAvatar && $i" class="_button" :class="$style.buttonsLeft" @click="openAccountMenu">
 			<MkAvatar :class="$style.avatar" :user="$i" />
 		</div>
-		<div v-else-if="narrow && !hideTitle" :class="$style.buttonsLeft" />
+		<div v-else-if="!thin_ && narrow && !hideTitle" :class="$style.buttonsLeft" />
 
 		<template v-if="metadata">
 			<div v-if="!hideTitle" :class="$style.titleContainer" @click="top">
@@ -21,7 +21,7 @@
 			</div>
 			<XTabs v-if="!narrow || hideTitle" :class="$style.tabs" :tab="tab" @update:tab="key => emit('update:tab', key)" :tabs="tabs" :root-el="el" @tab-click="onTabClick"/>
 		</template>
-		<div v-if="(narrow && !hideTitle) || (actions && actions.length > 0)" :class="$style.buttonsRight">
+		<div v-if="(!thin_ && narrow && !hideTitle) || (actions && actions.length > 0)" :class="$style.buttonsRight">
 			<template v-for="action in actions">
 				<button v-tooltip.noDelay="action.text" class="_button" :class="[$style.button, { [$style.highlighted]: action.highlighted }]" @click.stop="action.handler" @touchstart="preventDrag"><i :class="action.icon"></i></button>
 			</template>
@@ -142,6 +142,7 @@ onUnmounted(() => {
 .upper {
 	--height: 50px;
 	display: flex;
+	gap: var(--margin);
 	height: var(--height);
 
 	.tabs:first-child {
@@ -151,12 +152,9 @@ onUnmounted(() => {
 		padding-left: 16px;
 		mask-image: linear-gradient(90deg, rgba(0,0,0,0), rgb(0,0,0) 16px, rgb(0,0,0) 100%);
 	}
-	.tabs:last-child {
+	.tabs {
 		margin-right: auto;
 	}
-	.tabs:not(:last-child) {
-		margin-right: 0;
-	}
 
 	&.thin {
 		--height: 42px;
@@ -170,19 +168,14 @@ onUnmounted(() => {
 
 	&.slim {
 		text-align: center;
+		gap: 0;
 
+		.tabs:first-child {
+			margin-left: 0;
+		}
 		> .titleContainer {
-			flex: 1;
 			margin: 0 auto;
 			max-width: 100%;
-
-			> *:first-child {
-				margin-left: auto;
-			}
-
-			> *:last-child {
-				margin-right: auto;
-			}
 		}
 	}
 }
@@ -198,8 +191,6 @@ onUnmounted(() => {
 	align-items: center;
 	min-width: var(--height);
 	height: var(--height);
-	margin: 0 var(--margin);
-
 	&:empty {
 		width: var(--height);
 	}
@@ -207,12 +198,12 @@ onUnmounted(() => {
 
 .buttonsLeft {
 	composes: buttons;
-	margin-right: auto;
+	margin: 0 var(--margin) 0 0;
 }
 
 .buttonsRight {
 	composes: buttons;
-	margin-left: auto;
+	margin: 0 0 0 var(--margin);
 }
 
 .avatar {
@@ -257,7 +248,7 @@ onUnmounted(() => {
 	white-space: nowrap;
 	text-align: left;
 	font-weight: bold;
-	flex-shrink: 0;
+	flex-shrink: 1;
 	margin-left: 24px;
 }