{
  "timeline": [
    {
      "date": "1955/1",
      "category": "",
      "region": "",
      "importance": 4,
      "event": "ヤマハ発動機株式会社を設立",
      "detail": "",
      "significance": "戦時遊休資産の転用が生んだ後発二輪メーカーの量産優位",
      "source": ""
    },
    {
      "date": "1959",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "北川自動車に資本参加",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1960/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "昌和製作所に資本参加",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1960/7",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "マリン事業に新規参入",
      "detail": "エンジンの製造技術を応用して、ボート・船外機に参入",
      "significance": "",
      "source": ""
    },
    {
      "date": "1961/9",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "特約店を整備",
      "detail": "",
      "significance": "親会社の営業所に間借りした販売体制が抱えた構造的脆弱性",
      "source": ""
    },
    {
      "date": "1961/9",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "東証に株式上場",
      "detail": "",
      "significance": "増資による希薄化が生んだ親子上場と人的支配の並存構造",
      "source": ""
    },
    {
      "date": "1963/4",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "販売不振で減収",
      "detail": "",
      "significance": "国内成熟期に外需で稼働率を補完する輸出依存モデルの原型",
      "source": ""
    },
    {
      "date": "1966/10",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "磐田工場を新設",
      "detail": "",
      "significance": "四輪車を選ばずに輸出量産拠点に賭けた1960年代の分岐点",
      "source": ""
    },
    {
      "date": "1967",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "北米向け車種「350R1」を発表",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1971/4",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "海外拠点の拡充",
      "detail": "日本国内における集中生産によるコストダウンのため、販売台数を増加させるために欧州・南米・東南アジアに現地法人を設立",
      "significance": "",
      "source": ""
    },
    {
      "date": "1973/5",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "船外機でマーキュリー社と合弁契約を締結",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1977/1",
      "category": "海外進出",
      "region": "",
      "importance": 3,
      "event": "Yamaha Motor Corporation, U.S.Aを設立",
      "detail": "",
      "significance": "輸出130万台時代に販売管理を内製化した北米法人設立の必然",
      "source": ""
    },
    {
      "date": "1982",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "二輪車増産（HY戦争）",
      "detail": "",
      "significance": "シェア首位を狙った増産がホンダの全面報復を招いた構図",
      "source": ""
    },
    {
      "date": "1983/4",
      "category": "",
      "region": "",
      "importance": 4,
      "event": "赤字転落・再建計画を策定",
      "detail": "",
      "significance": "年産350万台を150万台に半減し損失を一括処理した再建手法",
      "source": ""
    },
    {
      "date": "1984/2",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "産業用ロボットに新規参入",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1986/10",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "Yamaha Motor Manufacturing Corporation of Americaを設立",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1986/12",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "台湾山葉機車工業を設立",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1988/3",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "米フォード向け自動車エンジンの製造を開始",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1992/12",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "ヤマハとの合併説を否定",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1998/1",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "Yamaha Motor Vietnamを設立",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1998/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "国内4販社を統合",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1998/9",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "マリン事業の構造改革",
      "detail": "",
      "significance": "「聖域」と化したマリン事業に初めてメスを入れた構造改革",
      "source": ""
    },
    {
      "date": "2000/3",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "トヨタ自動車と業務提携を締結",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2004/6",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "決算期を3月31日から12月31日に変更",
      "detail": "決算期を3月31日から12月31日に変更した。海外売上比率の高さに合わせ、グローバル子会社の決算期と整合させる目的の制度変更であった。",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2006/5",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "グローバルパーツセンターを新設",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2007/5",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "Yamaha Motor Philippines を設立",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2008/6",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "ヤマハマリン袋井工場を新設",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2009/12",
      "category": "",
      "region": "",
      "importance": 4,
      "event": "赤字転落。構造改革を開始",
      "detail": "",
      "significance": "規模成長の前提を放棄し損益分岐点型の経営へ転換した転機",
      "source": ""
    },
    {
      "date": "2013",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "四輪車に参入（凍結）",
      "detail": "",
      "significance": "1960年代に見送った四輪車参入を半世紀後に試み再び退いた経緯",
      "source": ""
    },
    {
      "date": "2017/2",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "浜松ロボティスク事務所を新設",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2019/6",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "新川およびアピックヤマダを買収",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2021/2",
      "category": "事業売却",
      "region": "",
      "importance": 3,
      "event": "浜北工場の閉鎖を決定",
      "detail": "",
      "significance": "創業地の閉鎖決定と延期が示す生産拠点再編の実行難度",
      "source": ""
    },
    {
      "date": "2022/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "東証プライム市場へ移行",
      "detail": "東京証券取引所の市場区分見直しにより、市場第一部からプライム市場へ移行した。",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/7",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "ヤマハロボティクスHDが新川等を吸収合併・商号変更",
      "detail": "ヤマハロボティクスホールディングスが新川・アピックヤマダ・PFAを吸収合併し、ヤマハロボティクス株式会社へ商号変更した。2019年に買収した産業用装置事業群の組織統合であり、ロボティクス領域の指揮系統を一本化した。",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/10",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "シルチェスターが株式追加を取得",
      "detail": "英国系の投資ファンド（シルチェスター・インターナショナル）が、ヤマハ発動機の株式を追加取得。2025年10月時点で8.79%の株式を保有し、ヤマハ発動機における推定第２位の大株主となった。",
      "significance": "",
      "source": ""
    },
    {
      "date": "2025/12",
      "category": "事業撤退",
      "region": "",
      "importance": 2,
      "event": "汎用エンジン事業・発電機事業から撤退",
      "detail": "1969年から手がけてきた汎用エンジン事業、および1973年から販売してきた発電機事業から同月をもって撤退した。半世紀以上にわたる主力周辺事業の整理であり、二輪・マリン・産業用ロボット領域への経営資源集中を進めた。",
      "significance": "",
      "source": "有価証券報告書"
    }
  ]
}