{
  "spec_version": "6",
  "endpoint": "ceo-person",
  "stock_code": "6526",
  "company_name": "ソシオネクスト",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/6526/executives/ceo/hizuka-masahiro/",
  "api_url": "/api/6526/ceo/hizuka-masahiro.json",
  "updated": "2026-11-10",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6526/executives/ceo/hizuka-masahiro/",
  "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": "hizuka-masahiro",
    "name": "肥塚雅博",
    "kana": "こえづか　まさひろ",
    "surname": "肥塚",
    "given_name": "雅博",
    "origin": "外部出身（2014年9月に設立準備会社の代表取締役として参画）。通商産業省から富士通取締役執行役員専務・副会長を経て当社に転じ、2018年4月にCEO、2022年3月に社長を兼務",
    "origin_type": "外部出身",
    "hometown": null,
    "education": "東京大学法学部 (1974)",
    "education_source": "https://www.socionext.com/jp/pr/sn_pr20171221_01j.pdf",
    "prev_role": "代表取締役会長兼CEO",
    "career": [
      {
        "company": "通商産業省",
        "from": "1974-04",
        "to": "2010-06",
        "roles": [
          {
            "date": "1974-04",
            "role": "入省",
            "event": "入省"
          }
        ]
      },
      {
        "company": "富士通",
        "from": "2010-06",
        "to": "2014-09",
        "roles": [
          {
            "date": "2010-06",
            "role": "取締役執行役員専務",
            "board": "取締役",
            "officer": "執行役員専務"
          },
          {
            "date": "2013-05",
            "role": "取締役執行役員副会長",
            "board": "取締役",
            "officer": "執行役員副会長"
          }
        ]
      },
      {
        "company": "ソシオネクスト",
        "from": "2014-09",
        "to": null,
        "roles": [
          {
            "date": "2014-09",
            "role": "代表取締役",
            "board": "代表取締役"
          },
          {
            "date": "2018-04",
            "role": "代表取締役会長兼CEO",
            "board": "代表取締役",
            "title": "会長",
            "officer": "CEO"
          },
          {
            "date": "2022-03",
            "role": "代表取締役会長兼社長兼CEO",
            "board": "代表取締役",
            "title": "会長兼社長",
            "officer": "CEO",
            "is_ceo_appointed": true
          },
          {
            "date": "2025",
            "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/6526/executives/ceo/hizuka-masahiro/",
    "term_start": "2022-03",
    "term_end": "2025",
    "api_url": "https://the-shashi.com/api/6526/ceo/hizuka-masahiro.json",
    "list_api_url": "https://the-shashi.com/api/6526/ceo.json",
    "predecessor": null,
    "successor": {
      "slug": "yoshida-hisato",
      "name": "吉田久人",
      "api_url": "https://the-shashi.com/api/6526/ceo/yoshida-hisato.json"
    }
  }
}