{
  "timeline": [
    {
      "date": "1914/8",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "三井合名会社に不動産課を設置",
      "detail": "",
      "significance": "三井家の不動産管理機能が組織化された起点",
      "source": "有価証券報告書"
    },
    {
      "date": "1940/8",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "三井物産が三井合名不動産課を吸収",
      "detail": "",
      "significance": "三井家の不動産機能が商社傘下に一度統合",
      "source": ""
    },
    {
      "date": "1941/7",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "三井不動産株式会社を設立",
      "detail": "三井物産から不動産部門を分離継承。三井11家が全額出資、資本金300万円",
      "significance": "戦時下に三井家の不動産管理会社として発足",
      "source": "有価証券報告書",
      "amount": "資本金300万円"
    },
    {
      "date": "1949/5",
      "category": "株式上場",
      "region": "",
      "importance": 3,
      "event": "東京証券取引所に株式上場",
      "detail": "GHQ財閥解体で三井11家の全株式所有が禁止され一般公開",
      "significance": "財閥解体に伴う株式公開",
      "source": ""
    },
    {
      "date": "1949/6",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "大阪証券取引所に株式上場",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1950/4",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "札幌証券取引所に株式上場",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "1955",
      "category": "社長交代",
      "region": "",
      "importance": 3,
      "event": "江戸英雄が社長に就任",
      "detail": "",
      "significance": "管理会社から事業会社への転換点を主導",
      "source": ""
    },
    {
      "date": "1956/10",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "株式会社三井本社を吸収合併",
      "detail": "清算中の三井本社を統合し三井の本格的血脈を継承",
      "significance": "三井家血脈の承継と事業会社化の基礎",
      "source": "有価証券報告書"
    },
    {
      "date": "1957/10",
      "category": "経営計画",
      "region": "",
      "importance": 4,
      "event": "千葉県市原地区の埋立事業を開始",
      "detail": "臨海土地造成事業の第一歩。社運を賭けた大規模事業",
      "significance": "総合デベロッパーへの転換の起点となる臨海土地造成事業",
      "source": ""
    },
    {
      "date": "1961/8",
      "category": "経営計画",
      "region": "",
      "importance": 3,
      "event": "住宅・宅地造成事業へ進出",
      "detail": "都市近郊の宅地不足を背景に単なる宅地造成から街づくりへ",
      "significance": "住宅造成事業の本格展開",
      "source": "有価証券報告書"
    },
    {
      "date": "1968/4",
      "category": "設備投資",
      "region": "",
      "importance": 4,
      "event": "わが国初の超高層ビル「霞が関ビルディング」（36階）が竣工",
      "detail": "",
      "significance": "超高層ビル時代の幕開けとビル賃貸事業の飛躍",
      "source": "有価証券報告書"
    },
    {
      "date": "1968",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "川崎市百合ヶ丘ガーデンマンションで中高層住宅に進出",
      "detail": "",
      "significance": "マンション分譲事業の起点",
      "source": ""
    },
    {
      "date": "1969/7",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "三井不動産販売株式会社を設立",
      "detail": "住宅・宅地販売活動の強化",
      "significance": "販売機能の子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "1970/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "朝日土地興業株式会社を合併",
      "detail": "",
      "significance": "販売網の拡充",
      "source": "有価証券報告書"
    },
    {
      "date": "1971",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "三田綱町にわが国初の超高層住宅を実現",
      "detail": "",
      "significance": "超高層住宅分野の先行",
      "source": ""
    },
    {
      "date": "1973/5",
      "category": "",
      "region": "米州",
      "importance": 2,
      "event": "米国三井不動産株式会社を設立",
      "detail": "",
      "significance": "海外進出の本格化",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/12",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "新名古屋ビル株式会社を合併",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1974/9",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "新宿三井ビルディング（55階）竣工",
      "detail": "",
      "significance": "第2の超高層ビル完成",
      "source": "有価証券報告書"
    },
    {
      "date": "1974/10",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "三井ホーム株式会社・三井不動産建設株式会社を設立",
      "detail": "三井ホームはツーバイフォー工法住宅事業。三井不動産建設は臨海土地造成を継承",
      "significance": "総合デベロッパー体制の整備",
      "source": "有価証券報告書"
    },
    {
      "date": "1980/5",
      "category": "経営計画",
      "region": "",
      "importance": 3,
      "event": "共同事業システム「Ｌｅｔ'ｓ」を開始",
      "detail": "土地所有者との共同事業システム",
      "significance": "土地税制改正を機とする事業手法の多様化",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/3",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "MITSUI FUDOSAN (SINGAPORE) PTE. LTD.を設立",
      "detail": "",
      "significance": "アジア拠点の設置",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/4",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "SC事業第1号「ららぽーと船橋」を開業",
      "detail": "後の三井ショッピングパーク ららぽーとTOKYO-BAY",
      "significance": "商業施設（SC）事業への本格参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/9",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "ハワイ「ハレクラニ」開業",
      "detail": "",
      "significance": "ラグジュアリーホテル事業の先駆",
      "source": "有価証券報告書"
    },
    {
      "date": "1984/1",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "「三井ガーデンホテル大阪」を開業",
      "detail": "国内直営ホテルチェーンの第1号",
      "significance": "ホテル事業の展開",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/1",
      "category": "",
      "region": "欧州",
      "importance": 1,
      "event": "MITSUI FUDOSAN (U.K.) LTD.を設立",
      "detail": "",
      "significance": "欧州拠点の設置",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/3",
      "category": "事業売却",
      "region": "",
      "importance": 2,
      "event": "三井不動産建設株式会社の全株式を売却",
      "detail": "",
      "significance": "建設事業からの撤退",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/10",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "三井不動産販売株式会社を株式交換で完全子会社化",
      "detail": "後の三井不動産リアルティ",
      "significance": "販売機能の取り込み強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2003",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "岩沙弘道が社長に就任",
      "detail": "",
      "significance": "",
      "source": ""
    },
    {
      "date": "2005/7",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "日本橋三井タワー竣工",
      "detail": "",
      "significance": "日本橋再開発の象徴",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/12",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "三井不動産レジデンシャル株式会社を設立",
      "detail": "住宅事業の再編",
      "significance": "住宅分譲機能の集約",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/1",
      "category": "設備投資",
      "region": "",
      "importance": 4,
      "event": "東京ミッドタウン竣工",
      "detail": "赤坂・六本木の大規模ミクストユース開発",
      "significance": "大規模ミクストユース開発の到達点",
      "source": "有価証券報告書"
    },
    {
      "date": "2011/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "菰田正信が代表取締役社長に就任",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/7",
      "category": "経営計画",
      "region": "",
      "importance": 2,
      "event": "柏の葉スマートシティ「ゲートスクエア」営業開始",
      "detail": "",
      "significance": "スマートシティ開発の本格化",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/2",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "東京ミッドタウン日比谷竣工",
      "detail": "",
      "significance": "日比谷エリアの再開発",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/10",
      "category": "設備投資",
      "region": "米州",
      "importance": 3,
      "event": "「55ハドソンヤード」竣工",
      "detail": "ニューヨーク",
      "significance": "米国オフィス事業の旗艦",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/10",
      "category": "企業買収",
      "region": "",
      "importance": 3,
      "event": "三井ホーム株式会社を株式公開買付で完全子会社化",
      "detail": "",
      "significance": "戸建住宅事業の取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "通期売上高1兆9,056億円、純利益1,840億円",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書",
      "amount": "売上高1兆9,056億円、純利益1,840億円"
    },
    {
      "date": "2021/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "通期純利益1,296億円に減益",
      "detail": "コロナ禍でホテル・リゾート事業が悪化",
      "significance": "コロナによるホテル事業打撃",
      "source": "有価証券報告書",
      "amount": "売上高2兆0,076億円、純利益1,296億円"
    },
    {
      "date": "2022/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "通期純利益1,770億円に回復",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書",
      "amount": "売上高2兆1,009億円、純利益1,770億円"
    },
    {
      "date": "2023/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "通期純利益1,970億円",
      "detail": "VISION2025の営業利益目標3,300億円に接近",
      "significance": "",
      "source": "有価証券報告書",
      "amount": "売上高2兆2,691億円、純利益1,970億円"
    },
    {
      "date": "2023/4",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "植田俊が代表取締役社長に就任",
      "detail": "菰田正信から交代。「目指す姿は産業デベロッパー」を表明",
      "significance": "街づくりから産業づくりへという方向転換",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/4",
      "category": "企業買収",
      "region": "",
      "importance": 3,
      "event": "株式会社東京ドームを株式公開買付で連結子会社化",
      "detail": "",
      "significance": "都市空間からエンタメ運営まで統合",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/4",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "東京証券取引所の市場区分見直しによりプライム市場に移行",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/4",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "日本橋室町三井タワー・東京ミッドタウン八重洲・LaLa arena TOKYO-BAY竣工",
      "detail": "",
      "significance": "日本橋・八重洲エリア再開発群の完成",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/4",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "50ハドソンヤード竣工",
      "detail": "ニューヨーク旗艦オフィス",
      "significance": "ニューヨーク旗艦物件の拡充",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/5",
      "category": "経営計画",
      "region": "",
      "importance": 4,
      "event": "長期経営方針「& INNOVATION 2030」を発表",
      "detail": "2026年度純利益2,700億円以上、EPS年平均成長率8％以上、ROE 8.5％以上、総還元性向50％以上",
      "significance": "産業デベロッパー構想の定量化",
      "source": "IR",
      "amount": "純利益目標2,700億円以上"
    },
    {
      "date": "2024/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "通期売上高2兆3,833億円、純利益2,246億円",
      "detail": "",
      "significance": "業績予想2,200億円を上振れ",
      "source": "有価証券報告書",
      "amount": "売上高2兆3,833億円、純利益2,246億円"
    },
    {
      "date": "2025/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "通期売上高2兆6,254億円、純利益2,488億円",
      "detail": "過去最高",
      "significance": "長期経営方針初年度の順調な進捗",
      "source": "有価証券報告書",
      "amount": "売上高2兆6,254億円、純利益2,488億円"
    }
  ]
}