{
  "spec_version": "5",
  "endpoint": "ceo",
  "stock_code": "5404",
  "company_name": "日本鋼管",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/5404/ceo/",
  "api_url": "/api/5404/ceo.json",
  "updated": "2026-10-27",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/5404/ceo/",
  "source": {
    "ceo": {
      "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"
    }
  },
  "count": 12,
  "ceo": [
    {
      "slug": "shiraishi-motojiro",
      "name": "白石元治郎",
      "kana": "しらいし　もとじろう",
      "term_start": "1912-06",
      "term_end": "1921-06",
      "origin_type": "創業家",
      "milestone": null,
      "prev_role": "東洋汽船取締役支配人",
      "api_url": "https://the-shashi.com/api/5404/ceo/shiraishi-motojiro.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/shiraishi-motojiro/"
    },
    {
      "slug": "okawa-heizaburo",
      "name": "大川平三郎",
      "kana": "おおかわ　へいざぶろう",
      "term_start": "1921-06",
      "term_end": "1942-06",
      "origin_type": "外部出身",
      "milestone": null,
      "prev_role": "取締役",
      "api_url": "https://the-shashi.com/api/5404/ceo/okawa-heizaburo.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/okawa-heizaburo/"
    },
    {
      "slug": "asano-ryozo",
      "name": "浅野良三",
      "kana": "あさの　りょうぞう",
      "term_start": "1942-06",
      "term_end": "1946-04",
      "origin_type": null,
      "milestone": null,
      "prev_role": "副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/asano-ryozo.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/asano-ryozo/"
    },
    {
      "slug": "渡辺政人",
      "name": "渡辺政人",
      "kana": null,
      "term_start": "1946-04",
      "term_end": "1947-05",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": null,
      "api_url": "https://the-shashi.com/api/5404/ceo/渡辺政人.json"
    },
    {
      "slug": "kawada-shige",
      "name": "河田重",
      "kana": "かわだ　しげ",
      "term_start": "1947-05",
      "term_end": "1963-11",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": null,
      "api_url": "https://the-shashi.com/api/5404/ceo/kawada-shige.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/kawada-shige/"
    },
    {
      "slug": "赤坂武",
      "name": "赤坂武",
      "kana": null,
      "term_start": "1963-11",
      "term_end": "1971-06",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": "取締役副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/赤坂武.json"
    },
    {
      "slug": "makita-hisao",
      "name": "槇田久生",
      "kana": "まきた　ひさお",
      "term_start": "1971-06",
      "term_end": "1980-06",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": "代表取締役副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/makita-hisao.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/makita-hisao/"
    },
    {
      "slug": "kanao-minoru",
      "name": "金尾実",
      "kana": "かなお　みのる",
      "term_start": "1980-06",
      "term_end": "1985-06",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": "代表取締役副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/kanao-minoru.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/kanao-minoru/"
    },
    {
      "slug": "yamashiro-yoshinari",
      "name": "山城彬成",
      "kana": "やましろ　よしなり",
      "term_start": "1985-06",
      "term_end": "1992-06",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": "副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/yamashiro-yoshinari.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/yamashiro-yoshinari/"
    },
    {
      "slug": "miyoshi-shunkichi",
      "name": "三好俊吉",
      "kana": "みよし　しゅんきち",
      "term_start": "1992-06",
      "term_end": "1997-06",
      "origin_type": "生え抜き",
      "milestone": "技術畑出身で初",
      "prev_role": "副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/miyoshi-shunkichi.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/miyoshi-shunkichi/"
    },
    {
      "slug": "shimogaichi-yoichi",
      "name": "下垣内洋一",
      "kana": "しもがいち　よういち",
      "term_start": "1997-06",
      "term_end": "2002-02",
      "origin_type": "生え抜き",
      "milestone": null,
      "prev_role": "副社長・鉄鋼事業本部長",
      "api_url": "https://the-shashi.com/api/5404/ceo/shimogaichi-yoichi.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/shimogaichi-yoichi/"
    },
    {
      "slug": "hammyo-masayuki",
      "name": "半明正之",
      "kana": "はんみょう　まさゆき",
      "term_start": "2002-02",
      "term_end": null,
      "origin_type": null,
      "milestone": null,
      "prev_role": "副社長",
      "api_url": "https://the-shashi.com/api/5404/ceo/hammyo-masayuki.json",
      "html_url": "https://the-shashi.com/tse/5404/executives/ceo/hammyo-masayuki/"
    }
  ]
}