diff --git a/packages/smarthr-ui/src/components/Textarea/Textarea.stories.tsx b/packages/smarthr-ui/src/components/Textarea/Textarea.stories.tsx
deleted file mode 100644
index d9612b4c2e..0000000000
--- a/packages/smarthr-ui/src/components/Textarea/Textarea.stories.tsx
+++ /dev/null
@@ -1,121 +0,0 @@
-import { StoryFn } from '@storybook/react'
-import { userEvent, within } from '@storybook/test'
-import React, { useState } from 'react'
-import styled from 'styled-components'
-
-import { FormControl } from '../FormControl'
-import { Stack } from '../Layout'
-
-import { Textarea } from './Textarea'
-
-export default {
-  title: 'Forms（フォーム）/Textarea',
-  component: Textarea,
-}
-
-const defaultValue = 'message👌'
-
-const Template: StoryFn = () => {
-  const [value1, setValue1] = useState(defaultValue)
-  const [value2, setValue2] = useState(defaultValue)
-  const [value3, setValue3] = useState(defaultValue)
-  return (
-    <ListStack>
-      <li>
-        <FormControl title="標準">
-          <Textarea name="default" />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="入力欄を自動で広げる（初期： 3行、最大： 10行）">
-          <Textarea name="auto_resize" cols={35} rows={3} maxRows={10} autoResize />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="幅指定">
-          <Textarea name="width" width="100%" />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="disabled">
-          <Textarea name="disabled" disabled={true} />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="エラー時" autoBindErrorInput={false}>
-          <Textarea name="error" error={true} />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="エラー時 with FormControl" errorMessages={['エラーメッセージ']}>
-          <Textarea name="error" />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="最大文字数 (defaultValue)">
-          <Textarea
-            name="max_length_with_default_value"
-            maxLetters={140}
-            defaultValue={defaultValue}
-          />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="最大文字数 (value)">
-          <Textarea
-            name="max_length_with_value"
-            maxLetters={140}
-            value={value1}
-            onChange={(e) => setValue1(e.target.value)}
-          />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="最大文字数 (value)">
-          <Textarea
-            name="max_length_with_value_over"
-            maxLetters={10}
-            value={value2}
-            onChange={(e) => setValue2(e.target.value)}
-          />
-        </FormControl>
-      </li>
-      <li>
-        <FormControl title="最大文字数 (decorators)">
-          <Textarea
-            name="max_length_with_value_and_decorators"
-            maxLetters={140}
-            value={value3}
-            onChange={(e) => setValue3(e.target.value)}
-            decorators={{
-              beforeMaxLettersCount: (txt) => `entry limit(${txt})`,
-              afterMaxLettersCount: (txt) => ` characters(${txt})`,
-              afterMaxLettersCountExceeded: (txt) => ` exceeded(${txt})`,
-            }}
-          />
-        </FormControl>
-      </li>
-    </ListStack>
-  )
-}
-
-export const All = Template.bind({})
-
-export const RegInput = Template.bind({})
-RegInput.play = async ({ canvasElement }) => {
-  const canvas = within(canvasElement)
-  const notResizableTextarea = await canvas.findByLabelText('標準')
-  // デフォルトでは入力欄が広がらないことを確認する
-  await userEvent.type(notResizableTextarea, 'hoge\n'.repeat(3), { delay: 0.1 })
-
-  const resizableTextarea = await canvas.findByLabelText(
-    '入力欄を自動で広げる（初期： 3行、最大： 10行）',
-  )
-  // 11行入力し、入力欄が10行以上広がらないことを確認する
-  await userEvent.type(resizableTextarea, 'hoge\n'.repeat(11), { delay: 0.1 })
-}
-
-const ListStack = styled(Stack).attrs({ forwardedAs: 'ul', gap: 1.5 })`
-  padding: 0 24px;
-  list-style: none;
-`