{
  "spec_version": "5",
  "endpoint": "ceo-person",
  "stock_code": "5231",
  "company_name": "日本セメント",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/5231/executives/ceo/kitaoka-toru/",
  "api_url": "/api/5231/ceo/kitaoka-toru.json",
  "updated": "2026-10-27",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/5231/executives/ceo/kitaoka-toru/",
  "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": "kitaoka-toru",
    "name": "北岡徹",
    "kana": "きたおか　とおる",
    "origin": "生え抜き（1946年入社）。機械事業部長・工務部長を務めた技術畑で、常務・専務を経て社長へ",
    "origin_type": "生え抜き",
    "milestone": null,
    "hometown": "愛媛県",
    "birthdate": "1923-05-20",
    "education": "東京帝国大学第一工学部機械科 (1946)",
    "prev_role": "専務取締役",
    "career": [
      {
        "company": "日本セメント",
        "from": "1946-10",
        "to": null,
        "roles": [
          {
            "date": "1946-10",
            "role": "浅野セメント入社"
          },
          {
            "date": "1976-07",
            "role": "取締役機械事業部長"
          },
          {
            "date": "1978",
            "role": "取締役工務部長"
          },
          {
            "date": "1979-07",
            "role": "常務取締役"
          },
          {
            "date": "1980-07",
            "role": "専務取締役"
          },
          {
            "date": "1982-07",
            "role": "取締役社長",
            "is_ceo_appointed": true
          },
          {
            "date": "1992-06",
            "role": "社長退任",
            "is_ceo_retired": true,
            "retirement_basis": "press"
          }
        ]
      }
    ],
    "references": [
      {
        "source": "日経ビジネス 1982年11月29日号 p96-97「北岡徹氏（日本セメント）」",
        "for": [
          "hometown",
          "birthdate",
          "education",
          "career"
        ]
      },
      {
        "source": "日本企業要覧 1981年版",
        "url": "https://dl.ndl.go.jp/pid/11937719/1/778",
        "for": [
          "career",
          "education",
          "hometown"
        ]
      },
      {
        "source": "百年史（日本セメント、1983年）第8章第4節",
        "url": "https://dl.ndl.go.jp/pid/11956329",
        "for": [
          "career"
        ]
      },
      {
        "source": "日経ビジネス 1992年7月13日号 p98-99「新社長登場 木村道夫氏（日本セメント）」",
        "for": [
          "career"
        ]
      }
    ],
    "html_url": "https://the-shashi.com/tse/5231/executives/ceo/kitaoka-toru/",
    "term_start": "1982-07",
    "term_end": "1992-06",
    "api_url": "https://the-shashi.com/api/5231/ceo/kitaoka-toru.json",
    "list_api_url": "https://the-shashi.com/api/5231/ceo.json",
    "predecessor": {
      "slug": "harashima-tamotsu",
      "name": "原島保",
      "api_url": "https://the-shashi.com/api/5231/ceo/harashima-tamotsu.json"
    },
    "successor": {
      "slug": "kimura-michio",
      "name": "木村道夫",
      "api_url": "https://the-shashi.com/api/5231/ceo/kimura-michio.json"
    }
  }
}