diff --git a/packages/frontend/src/components/primitives/Tab.tsx b/packages/frontend/src/components/primitives/Tab.tsx
index 0133ed1..251b503 100644
--- a/packages/frontend/src/components/primitives/Tab.tsx
+++ b/packages/frontend/src/components/primitives/Tab.tsx
@@ -1,12 +1,12 @@
-import React from 'react';
-import { useState } from 'react';
-import { useLayoutEffect } from 'react';
+import React, { useEffect, useLayoutEffect, useMemo, useRef, useState } from 'react';
+
 
 import { styled } from '@/libs/stitches';
 
 export type TabProp = {
 	children: React.ReactElement<TabItem> | React.ReactElement<TabItem>[]
 	value?: string;
+	direction?: 'vertical' | 'horizontal';
 	onChange?: (newValue: string) => void;
 };
 
@@ -31,29 +31,115 @@ const Ul = styled('ul', {
   display: 'flex',
   margin: 0,
   padding: 0,
+
+  defaultVariants: {
+    direction: 'horizontal',
+  },
+
+  variants: {
+    direction: {
+      horizontal: {
+        flexDirection: 'row',
+      },
+      vertical: {
+        flexDirection: 'column',
+      },
+    },
+  },
 });
 
 const Li = styled('li', {
   display: 'flex',
   alignItems: 'center',
   justifyContent: 'center',
-  padding: '$m',
+  padding: '$s $l',
   margin: 0,
-  borderBottom: '2px solid $muted',
   color: '$muted',
 
+  defaultVariants: {
+    direction: 'horizontal',
+  },
+
   variants: {
     active: {
       true: {
         color: '$primary',
       },
     },
+
+    direction: {
+      horizontal: {
+        borderBottom: '2px solid $divider',
+      },
+      vertical: {
+        borderLeft: '2px solid $divider',
+        justifyContent: 'flex-start',
+      },
+    },
+  },
+});
+
+const Indicator = styled('div', {
+  position: 'absolute',
+  background: '$primary',
+  transition: 'all 0.2s $timingFunction$default',
+
+  defaultVariants: {
+    direction: 'horizontal',
+  },
+
+  variants: {
+    direction: {
+      horizontal: {
+        bottom: 0,
+        height: 2,
+      },
+      vertical: {
+        left: 0,
+        width: 2,
+      },
+    },
   },
 });
 
 export const Tab: React.FC<TabProp> = (p) => {
-  const c = Array.isArray(p.children) ? p.children.map(c => c.props) : [p.children.props];
-  const [value, setValue] = useState(c[0].value);
+  const items = useMemo(() => Array.isArray(p.children) ? p.children.map(c => c.props) : [p.children.props], [p.children]);
+
+  const [value, setValue] = useState<string | null>(null);
+
+  const itemRefs = useRef<(HTMLLIElement | null)[]>([]);
+
+  const position = useMemo(() => {
+    let sum = 0;
+    const max = items.findIndex(item => item.value === value);
+    for (let i = 0; i < max; i++) {
+      const ref = itemRefs.current[i];
+      if (ref == null) return 0;
+      sum += p.direction === 'vertical' ? ref.clientHeight : ref.clientWidth;
+    }
+    console.log(`left: ${sum}`);
+    return sum;
+  }, [items, p.direction, value]);
+
+  const size = useMemo(() => {
+    const i = items.findIndex(item => item.value === value);
+    const ref = itemRefs.current[i];
+    if (ref == null) return 0;
+    return p.direction === 'vertical' ? ref.clientHeight : ref.clientWidth;
+  }, [items, p.direction, value]);
+
+  const indicatorStyle = useMemo(() => (p.direction === 'vertical' ? {
+    top: position, height: size,
+  }: {
+    left: position, width: size,
+  }), [p.direction, position, size]);
+
+  useEffect(() => {
+    itemRefs.current = itemRefs.current.slice(0, items.length);
+    if (value === null) {
+      setValue(items[0].value);
+    }
+  }, [items, value]);
 
   useLayoutEffect(() => {
     if (!p.value) return;
@@ -62,9 +148,9 @@ export const Tab: React.FC<TabProp> = (p) => {
 
   return (
     <Container>
-      <Ul>
-        {c.map(item => (
-          <Li key={item.value} role="button" active={item.value === value} onClick={() => {
+      <Ul direction={p.direction}>
+        {items.map((item, i) => (
+          <Li direction={p.direction} key={item.value} ref={el => itemRefs.current[i] = el} role="button" active={item.value === value} onClick={() => {
             if (item.value === value) return;
             console.log(item.value);
             setValue(item.value);
@@ -74,6 +160,7 @@ export const Tab: React.FC<TabProp> = (p) => {
           </Li>
         ))}
       </Ul>
+      <Indicator aria-hidden direction={p.direction} css={indicatorStyle} />
     </Container>
   );
 };
diff --git a/packages/frontend/src/stories/components/primitives/Tab.stories.tsx b/packages/frontend/src/stories/components/primitives/Tab.stories.tsx
index 6593835..0d06fc6 100644
--- a/packages/frontend/src/stories/components/primitives/Tab.stories.tsx
+++ b/packages/frontend/src/stories/components/primitives/Tab.stories.tsx
@@ -1,6 +1,6 @@
 import React from 'react';
 
-import type { Meta } from '@storybook/react';
+import type { Meta, StoryObj } from '@storybook/react';
 
 import { Tab, TabItem } from '@/components/primitives/Tab';
 
@@ -9,14 +9,30 @@ const meta = {
   parameters: {
     layouts: 'centered',
   },
+  args: {
+    children: ([
+      <TabItem key="home" value="home">ホーム</TabItem>,
+      <TabItem key="notification" value="notification">通知</TabItem>,
+      <TabItem key="explore" value="explore">みつける</TabItem>,
+    ]),
+  },
 } satisfies Meta<typeof Tab>;
 
 export default meta;
 
-export const Default = () => (
-  <Tab>
-    <TabItem value="home">ホーム</TabItem>
-    <TabItem value="notification">通知</TabItem>
-    <TabItem value="explore">みつける</TabItem>
-  </Tab>
-);
+type Story = StoryObj<typeof meta>;
+
+export const Default: Story = {};
+
+export const Horizontal: Story = {
+  args: {
+    direction: 'horizontal',
+  },
+};
+
+export const Vertical: Story = {
+  args: {
+    direction: 'vertical',
+  },
+};
+