{
  "spec_version": "5",
  "endpoint": "ceo-person",
  "stock_code": "4042",
  "company_name": "東ソー",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/4042/executives/ceo/yamamoto-toshinori/",
  "api_url": "/api/4042/ceo/yamamoto-toshinori.json",
  "updated": "2026-10-20",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/4042/executives/ceo/yamamoto-toshinori/",
  "source": {
    "person": {
      "primary": [
        "有価証券報告書（役員の状況）"
      ],
      "extraction": "EDINET の XBRL から機械抽出した役員表を土台に、雑誌記事・社史・報道で経歴と出自を補完",
      "caveat": "在任区間は career の is_ceo_appointed が正本。退任年月は次の代の就任年月から決まる"
    }
  },
  "person": {
    "slug": "yamamoto-toshinori",
    "name": "山本寿宣",
    "kana": "やまもと　としのり",
    "surname": "山本",
    "given_name": "寿宣",
    "origin": "生え抜き（1979年入社）。化学品事業部長・クロル・アルカリセクター長を経て2016年3月に社長就任",
    "origin_type": "生え抜き",
    "hometown": "山口県周南市",
    "education": "神戸大学経済学部 (1979)",
    "education_source": "https://ja.wikipedia.org/wiki/山本寿宣",
    "prev_role": "常務取締役",
    "career": [
      {
        "company": "東ソー",
        "from": "1979-04",
        "to": null,
        "roles": [
          {
            "date": "1979-04",
            "role": "入社",
            "event": "入社"
          },
          {
            "date": "2009-06",
            "role": "取締役",
            "board": "取締役"
          },
          {
            "date": "2011-06",
            "role": "常務取締役",
            "board": "取締役",
            "title": "常務"
          },
          {
            "date": "2015-06",
            "role": "代表取締役常務取締役",
            "board": "代表取締役",
            "title": "常務"
          },
          {
            "date": "2016-03",
            "role": "代表取締役社長",
            "board": "代表取締役",
            "title": "社長",
            "is_ceo_appointed": true
          },
          {
            "date": "2016-06",
            "role": "社長執行役員",
            "officer": "社長執行役員"
          },
          {
            "date": "2022-03",
            "role": "社長退任（次期社長登用による推定）",
            "title": "社長",
            "event": "退任",
            "estimated": true,
            "is_ceo_retired": true,
            "retirement_basis": "next_ceo"
          }
        ]
      }
    ],
    "html_url": "https://the-shashi.com/tse/4042/executives/ceo/yamamoto-toshinori/",
    "term_start": "2016-03",
    "term_end": "2022-03",
    "api_url": "https://the-shashi.com/api/4042/ceo/yamamoto-toshinori.json",
    "list_api_url": "https://the-shashi.com/api/4042/ceo.json",
    "predecessor": {
      "slug": "udagawa-kenichi",
      "name": "宇田川憲一",
      "api_url": "https://the-shashi.com/api/4042/ceo/udagawa-kenichi.json"
    },
    "successor": {
      "slug": "kuwada-mamoru",
      "name": "桒田守",
      "api_url": "https://the-shashi.com/api/4042/ceo/kuwada-mamoru.json"
    }
  }
}