{
  "spec_version": "6",
  "endpoint": "ceo-person",
  "stock_code": "4005",
  "company_name": "住友化学",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/4005/executives/ceo/yonekura-hiromasa/",
  "api_url": "/api/4005/ceo/yonekura-hiromasa.json",
  "updated": "2026-10-29",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/4005/executives/ceo/yonekura-hiromasa/",
  "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": "yonekura-hiromasa",
    "name": "米倉弘昌",
    "kana": "よねくら　ひろまさ",
    "surname": "米倉",
    "given_name": "弘昌",
    "origin": "生え抜き（1960年入社）。日本シンガポール石油化学社長を経て社長へ",
    "origin_type": "生え抜き",
    "hometown": null,
    "education": "デューク大学大学院経済学専攻修士課程 (1965)",
    "education_source": "https://ja.wikipedia.org/wiki/%E7%B1%B3%E5%80%89%E5%BC%98%E6%98%8C",
    "prev_role": "代表取締役専務",
    "career": [
      {
        "company": "住友化学",
        "from": "1960-04",
        "to": null,
        "roles": [
          {
            "date": "1960-04",
            "role": "入社",
            "event": "入社"
          },
          {
            "date": "1991-03",
            "role": "取締役",
            "board": "取締役"
          },
          {
            "date": "1995-03",
            "role": "常務取締役",
            "board": "取締役",
            "title": "常務"
          },
          {
            "date": "1998-06",
            "role": "代表取締役専務",
            "board": "代表取締役",
            "title": "専務"
          },
          {
            "date": "2000-06",
            "role": "代表取締役社長",
            "board": "代表取締役",
            "title": "社長",
            "is_ceo_appointed": true
          },
          {
            "date": "2009-04",
            "role": "代表取締役会長",
            "board": "代表取締役",
            "title": "会長"
          },
          {
            "date": "2009-04",
            "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"
          }
        ]
      },
      {
        "company": "日本シンガポール石油化学",
        "from": "2000-06",
        "to": null,
        "concurrent": true,
        "roles": [
          {
            "date": "2000-06",
            "role": "社長",
            "title": "社長"
          }
        ]
      },
      {
        "company": "日本経済団体連合会",
        "from": "2010-05",
        "to": null,
        "concurrent": true,
        "roles": [
          {
            "date": "2010-05",
            "role": "会長",
            "title": "会長"
          }
        ]
      }
    ],
    "html_url": "https://the-shashi.com/tse/4005/executives/ceo/yonekura-hiromasa/",
    "term_start": "2000-06",
    "term_end": "2009-04",
    "api_url": "https://the-shashi.com/api/4005/ceo/yonekura-hiromasa.json",
    "list_api_url": "https://the-shashi.com/api/4005/ceo.json",
    "predecessor": {
      "slug": "hijikata-takeshi",
      "name": "土方武",
      "api_url": "https://the-shashi.com/api/4005/ceo/hijikata-takeshi.json"
    },
    "successor": {
      "slug": "hirose-hiroshi",
      "name": "廣瀨博",
      "api_url": "https://the-shashi.com/api/4005/ceo/hirose-hiroshi.json"
    }
  }
}