{
  "spec_version": "4",
  "endpoint": "ceo",
  "stock_code": "5714",
  "company_name": "DOWA",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/5714/ceo/",
  "api_url": "/api/5714/ceo.json",
  "updated": "2026-09-18",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/5714/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": 13,
  "ceo": [
    {
      "slug": "kurushima-hidesaburo",
      "name": "久留島秀三郎",
      "kana": "くるしま　ひでさぶろう",
      "origin": "外部出身。南満洲鉄道・農商務省を経て昭和鉱業社長を務め、1946年10月に同和鉱業取締役社長へ就任",
      "origin_type": "外部出身",
      "hometown": "京都府",
      "education": "九州帝国大学工科大学採鉱学科 (1914)",
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1946-10",
          "to": "1963-05",
          "roles": [
            {
              "date": "1946-10",
              "role": "取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1963-05",
              "role": "代表取締役社長 退任"
            },
            {
              "date": "1963-05",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/kurushima-hidesaburo/",
      "term_start": "1946-10",
      "term_end": "1963-05"
    },
    {
      "slug": "arai-tomozo",
      "name": "新井友蔵",
      "kana": "あらい　ともぞう",
      "origin": null,
      "origin_type": null,
      "hometown": null,
      "education": null,
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1963-05",
          "to": "1973-05",
          "roles": [
            {
              "date": "1963-05",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1973-05",
              "role": "代表取締役社長 退任"
            },
            {
              "date": "1973-05",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/arai-tomozo/",
      "term_start": "1963-05",
      "term_end": "1973-05"
    },
    {
      "slug": "suzuki-yoshiteru",
      "name": "鈴木善照",
      "kana": "すずき　よしてる",
      "origin": null,
      "origin_type": null,
      "hometown": null,
      "education": null,
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1973-05",
          "to": "1977-06",
          "roles": [
            {
              "date": "1973-05",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1977-06",
              "role": "代表取締役社長 退任"
            },
            {
              "date": "1977-06",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/suzuki-yoshiteru/",
      "term_start": "1973-05",
      "term_end": "1977-06"
    },
    {
      "slug": "komori-hideo",
      "name": "小森英夫",
      "kana": "こもり　ひでお",
      "origin": null,
      "origin_type": null,
      "hometown": null,
      "education": null,
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1977-06",
          "to": "1981-06",
          "roles": [
            {
              "date": "1977-06",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1981-06",
              "role": "代表取締役社長 退任"
            },
            {
              "date": "1981-06",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/komori-hideo/",
      "term_start": "1977-06",
      "term_end": "1981-06"
    },
    {
      "slug": "nishida-takashi",
      "name": "西田堯",
      "kana": "にしだ　たかし",
      "origin": null,
      "origin_type": null,
      "hometown": null,
      "education": null,
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1981-06",
          "to": "1987-06",
          "roles": [
            {
              "date": "1981-06",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1987-06",
              "role": "代表取締役社長 退任"
            },
            {
              "date": "1987-06",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/nishida-takashi/",
      "term_start": "1981-06",
      "term_end": "1987-06"
    },
    {
      "slug": "niratani-sadaharu",
      "name": "韮谷定敏",
      "kana": "にらたに　さだはる",
      "origin": "生え抜き（1947年入社）。取締役・常務・副社長を経て社長へ",
      "origin_type": "生え抜き",
      "hometown": "熊本県",
      "education": "東京大学経済学部経済学科 (1947)",
      "prev_role": "副社長",
      "career": [
        {
          "company": "同和鉱業",
          "from": "1947-09",
          "to": null,
          "roles": [
            {
              "date": "1947-09",
              "role": "入社"
            },
            {
              "date": "1975-05",
              "role": "取締役"
            },
            {
              "date": "1979-06",
              "role": "常務取締役"
            },
            {
              "date": "1985-06",
              "role": "副社長"
            },
            {
              "date": "1987-06",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1993-06",
              "role": "代表取締役会長"
            },
            {
              "date": "1993-06",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            },
            {
              "date": "1998-06",
              "role": "取締役相談役"
            },
            {
              "date": "1999-06",
              "role": "相談役"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/niratani-sadaharu/",
      "term_start": "1987-06",
      "term_end": "1993-06"
    },
    {
      "slug": "harada-kenzo",
      "name": "原田謙三",
      "kana": "はらだ　けんぞう",
      "origin": null,
      "origin_type": null,
      "hometown": null,
      "education": null,
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1993-06",
          "to": "1999-06",
          "roles": [
            {
              "date": "1993-06",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "1999",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            },
            {
              "date": "1999-06",
              "role": "代表取締役社長 退任"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/harada-kenzo/",
      "term_start": "1993-06",
      "term_end": "1999"
    },
    {
      "slug": "kanaya-koichiro",
      "name": "金谷浩一郎",
      "kana": "かなや　こういちろう",
      "origin": null,
      "origin_type": null,
      "hometown": null,
      "education": null,
      "prev_role": null,
      "career": [
        {
          "company": "同和鉱業",
          "from": "1999",
          "to": "2002-04",
          "roles": [
            {
              "date": "1999",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "2002-04",
              "role": "代表取締役社長 退任"
            },
            {
              "date": "2002-04",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/kanaya-koichiro/",
      "term_start": "1999",
      "term_end": "2002-04"
    },
    {
      "slug": "yoshikawa-hirokazu",
      "name": "吉川廣和",
      "kana": "よしかわ　ひろかず",
      "origin": "生え抜き（1966年入社）。人事部長から新素材事業本部長を経て社長へ",
      "origin_type": "生え抜き",
      "hometown": "群馬県群馬郡箕郷町（現・高崎市）",
      "education": "東京大学教育学部教育行政学科 (1966)",
      "education_source": "https://ja.wikipedia.org/wiki/吉川廣和",
      "prev_role": "代表取締役副社長・COO",
      "career": [
        {
          "company": "DOWA",
          "from": "1966-04",
          "to": null,
          "roles": [
            {
              "date": "1966-04",
              "role": "入社"
            },
            {
              "date": "1989-06",
              "role": "企画本部人事部長"
            },
            {
              "date": "1993-06",
              "role": "取締役、企画本部副本部長兼人事部長、TQC推進本部副本部長"
            },
            {
              "date": "1995-06",
              "role": "取締役、新素材事業本部長"
            },
            {
              "date": "1997-06",
              "role": "常務取締役、新素材事業本部"
            },
            {
              "date": "1999-04",
              "role": "常務取締役、新素材事業本部長、企画本部長、管理本部長、運輸事業部・不動産事業部管掌"
            },
            {
              "date": "1999-06",
              "role": "代表取締役専務取締役、プランニング＆アドミニストレイションDiv.・エレクトロニクス マテリアルズDiv.・不動産事業部管掌"
            },
            {
              "date": "2000-04",
              "role": "代表取締役副社長"
            },
            {
              "date": "2001-04",
              "role": "代表取締役副社長・COO"
            },
            {
              "date": "2002-04",
              "role": "代表取締役社長・COO",
              "is_ceo_appointed": true
            },
            {
              "date": "2003-06",
              "role": "代表取締役社長・CEO"
            },
            {
              "date": "2006-10",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/yoshikawa-hirokazu/",
      "term_start": "2002-04",
      "term_end": "2006-10"
    },
    {
      "slug": "kono-masaki",
      "name": "河野正樹",
      "kana": "こうの　まさき",
      "origin": "生え抜き（1976年入社）。同和半導体社長・製錬技術畑を経て持株会社移行時に社長へ",
      "origin_type": "生え抜き",
      "hometown": "神奈川県",
      "education": "東京大学工学部金属工学科 (1976)",
      "education_source": "https://ja.wikipedia.org/wiki/河野正樹",
      "prev_role": "代表取締役",
      "career": [
        {
          "company": "DOWA",
          "from": "1976-04",
          "to": "2006-10",
          "roles": [
            {
              "date": "1976-04",
              "role": "入社"
            },
            {
              "date": "1996-04",
              "role": "㈱同和半導体常務取締役兼新素材事業本部半導体事業部半導体材料研究所長"
            },
            {
              "date": "1999-06",
              "role": "㈱同和半導体代表取締役社長"
            },
            {
              "date": "2001-04",
              "role": "メタルズ カンパニー企画室長"
            },
            {
              "date": "2001-06",
              "role": "執行役員、メタルズ カンパニー企画室長"
            },
            {
              "date": "2002-01",
              "role": "執行役員、メタルズ カンパニー企画室長兼製錬技術研究所長兼小坂・最終処分場建設本部副本部長"
            },
            {
              "date": "2003-04",
              "role": "執行役員、コーポレートスタッフ兼小坂・最終処分場建設本部副本部長"
            },
            {
              "date": "2003-06",
              "role": "取締役、コーポレートスタッフ管掌兼小坂・最終処分場建設本部副本部長"
            },
            {
              "date": "2005-04",
              "role": "取締役、コーポレートスタッフ管掌"
            },
            {
              "date": "2006-04",
              "role": "代表取締役"
            },
            {
              "date": "2006-10",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "2009-06",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        },
        {
          "company": "藤田観光",
          "from": "2005-05",
          "to": null,
          "roles": [
            {
              "date": "2005-05",
              "role": "監査役"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/kono-masaki/",
      "term_start": "2006-10",
      "term_end": "2009-06"
    },
    {
      "slug": "yamada-masao",
      "name": "山田政雄",
      "kana": "やまだ　まさお",
      "origin": "生え抜き（1978年入社）。DOWAエコシステム社長・小坂製錬社長を経て社長へ",
      "origin_type": "生え抜き",
      "hometown": "新潟県",
      "education": "信州大学経済学部",
      "education_source": "https://ja.wikipedia.org/wiki/山田政雄",
      "prev_role": "上席執行役員副社長",
      "career": [
        {
          "company": "DOWAホールディングス",
          "from": "1978-04",
          "to": null,
          "roles": [
            {
              "date": "1978-04",
              "role": "入社"
            },
            {
              "date": "2003-06",
              "role": "執行役員"
            },
            {
              "date": "2009-02",
              "role": "上席執行役員"
            },
            {
              "date": "2009-06",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "2018-06",
              "role": "代表取締役会長"
            },
            {
              "date": "2018-06",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "sections": {
        "tenure_summary": "非鉄・環境のDOWAを率いた生え抜き社長\n\n製錬を核とした環境・リサイクル事業への展開"
      },
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/yamada-masao/",
      "term_start": "2009-06",
      "term_end": "2018-06"
    },
    {
      "slug": "sekiguchi-akira",
      "name": "関口明",
      "kana": "せきぐち　あきら",
      "origin": "生え抜き（1983年入社）。小坂製錬社長・DOWAメタルマイン社長を経て社長へ",
      "origin_type": "生え抜き",
      "hometown": null,
      "education": "早稲田大学法学部 (1983)",
      "education_source": "https://www.nikkei.com/article/DGKKZO27925260Z00C18A3TJ1000/",
      "prev_role": "上席執行役員副社長",
      "career": [
        {
          "company": "DOWAホールディングス",
          "from": "1983-04",
          "to": null,
          "roles": [
            {
              "date": "1983-04",
              "role": "入社"
            },
            {
              "date": "2011-04",
              "role": "小坂製錬 代表取締役社長"
            },
            {
              "date": "2013-04",
              "role": "執行役員兼DOWAメタルマイン社長"
            },
            {
              "date": "2018-04",
              "role": "上席執行役員副社長"
            },
            {
              "date": "2018-06",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "2025-06",
              "role": "代表取締役社長執行役員CEO"
            },
            {
              "date": "2026-06",
              "role": "代表取締役会長CEO"
            },
            {
              "date": "2026-06",
              "role": "社長退任",
              "is_ceo_retired": true,
              "retirement_basis": "disclosure"
            }
          ]
        }
      ],
      "sections": {
        "tenure_summary": "中期計画2027下、PCB処理期限終了後の環境リサイクル事業を新規領域で組み立て直し、3軸経営の収益体質を再設計する経営者である。\n\n中国太陽光銀粉のシェア挽回非追求方針へ転換し、電子材料事業の収益構造を再設計した。"
      },
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/sekiguchi-akira/",
      "term_start": "2018-06",
      "term_end": "2026-06"
    },
    {
      "slug": "fukuda-kensaku",
      "name": "福田健作",
      "kana": "ふくだ　けんさく",
      "birthdate": "1966-08-04",
      "origin": "生え抜き（1992年入社）。秋田製錬・DOWAメタルマインと製錬の事業子会社の社長を経て、副社長執行役員から2026年6月に社長へ",
      "origin_type": "生え抜き",
      "hometown": "秋田県",
      "education": "金沢大学工学部 (1992)",
      "education_source": "https://www.japanmetal.com/news-h20260212147669.html",
      "prev_role": "副社長執行役員",
      "career": [
        {
          "company": "DOWAホールディングス",
          "from": "1992-04",
          "to": null,
          "roles": [
            {
              "date": "1992-04",
              "role": "入社"
            },
            {
              "date": "2010-04",
              "role": "秋田製錬 取締役"
            },
            {
              "date": "2013-06",
              "role": "秋田製錬 代表取締役"
            },
            {
              "date": "2016-04",
              "role": "技術部門"
            },
            {
              "date": "2019-04",
              "role": "DOWAメタルマイン 取締役 亜鉛事業部長"
            },
            {
              "date": "2022-04",
              "role": "秋田製錬 代表取締役社長"
            },
            {
              "date": "2024-04",
              "role": "執行役員 兼 DOWAメタルマイン 代表取締役社長"
            },
            {
              "date": "2026-04",
              "role": "副社長執行役員"
            },
            {
              "date": "2026-06",
              "role": "代表取締役 社長COO",
              "is_ceo_appointed": true
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/5714/executives/ceo/fukuda-kensaku/",
      "term_start": "2026-06",
      "term_end": null
    }
  ]
}