{
  "spec_version": "4",
  "endpoint": "history",
  "stock_code": "3099",
  "company_name": "三越伊勢丹ホールディングス",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/3099/decisions/",
  "api_url": "/api/3099/history.json",
  "updated": "2026-09-09",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/3099/decisions/",
  "source": {
    "long_term": {
      "primary": [
        "有価証券報告書",
        "会社年鑑",
        "会社年鑑 1976年版（上下期合算）"
      ],
      "extraction": "EDINET の XBRL、kabupro 掲載の旧有価証券報告書、会社年鑑・社史等からの転記",
      "row_field": "reference",
      "caveat": "創業期から現在までを 1 本に繋いだ長期系列のため、年代により出所・単位・連結範囲が変わる。行ごとの reference / unit / consolidation を必ず参照すること"
    },
    "decisions": {
      "html_url": "https://the-shashi.com/tse/3099/decisions/",
      "primary": [
        "企業の公表資料",
        "新聞・雑誌記事"
      ],
      "extraction": "本文は API に載せない。行ごとの html_url のページを参照すること"
    }
  },
  "title": "三越伊勢丹ホールディングスの歴史概略",
  "summary": {
    "title": "サマリー",
    "text": "",
    "description": "三越伊勢丹ホールディングスの歴史。2007年、三越と伊勢丹が経営統合に合意し、2008年に共同株式移転で発足。2011年の両社合併、大西洋社長の突然の退任、地方店の閉店と最高益回復までの沿革と経緯を執筆。"
  },
  "eras": [
    {
      "title": "共同株式移転による発足と、5年後750億円という設計",
      "start_year": 2007,
      "end_year": 2008
    },
    {
      "title": "統合初年度の純損失と、持株会社の下で進んだグループ再編",
      "start_year": 2009,
      "end_year": 2011
    },
    {
      "title": "大西洋の自主編集主義の徹底と、突然の社長交代までの5年",
      "start_year": 2012,
      "end_year": 2016
    },
    {
      "title": "構造改革優先からコロナ禍の営業赤字の底まで",
      "start_year": 2017,
      "end_year": 2021
    }
  ],
  "overview": [
    {
      "label": "創業",
      "text": "2008年4月1日、三越と伊勢丹が共同株式移転で持株会社の三越伊勢丹ホールディングスを設立し、2社は上場を廃止した。母体は1673年に三井高利氏が江戸で開いた越後屋の系譜を継ぐ三越と、1886年に小菅丹治氏が神田で開いた伊勢屋丹治呉服店を起点とする伊勢丹である。[格式の三越と編集力の伊勢丹を一つの資本の下へ置いた](/tse/3099/decisions/isetan-mitsukoshi-2008/)のは、1990年代以降の市場縮小で単独では全国の店舗網を維持できなくなったためだった。合算売上高1兆4,000億円で業界首位に立ったものの、統合前年の三越の営業利益は期初計画154億円から85億円へ落ち、両社の収益力の差は開いたままだった。"
    },
    {
      "label": "決断",
      "text": "店の数ではなく、基幹3店へ資源を集中する方向で一貫している。2012年に就任した大西洋社長は自主編集売場の拡大を進めたが、業績不振と機関決定前の情報発信への反発が重なり、2017年3月に[在任5年で退任した](/tse/3099/decisions/onishi-ouster-2017/)。後任の杉江俊彦体制は新宿本店・銀座店・日本橋本店の3店へ投資を絞り、伊勢丹松戸店や三越千葉店など地方店の閉鎖で固定費を圧縮した。2021年に就任した細谷敏幸社長は、クレジットカード・アプリ・外商の顧客IDを一つに集約し、来店を前提とする売場の商売から、購買履歴に基づく個別提案へ設計を移した。"
    },
    {
      "label": "現況",
      "text": "収益はもう売場の面積ではなく、名前のわかる顧客から出ている。2026年3月期の連結売上高は5,456億円、営業利益は800億円で、いずれも統合後の最高となった。報告セグメントは百貨店業・クレジット・金融・友の会業・不動産業の3つで、百貨店業が売上4,468億円・利益655億円と大半を占め、クレジット・金融・友の会業が210億円・63億円、不動産業が222億円・47億円で続く。店舗数を減らしながら顧客あたりの購入額を上げたことが、2021年3月期の営業赤字209億円から統合後最高益への反転を生んだ。"
    },
    {
      "label": "競合",
      "text": "百貨店は数を競う産業から、一店の売上を競う産業に変わった。1990年代以降の市場縮小に対し、各社は統合で規模を確保する。2007年に大丸と松坂屋が[共同持株会社J.フロント リテイリングを設立し](/tse/3086/decisions/daimaru-matsuzakaya-integration-2007/)、翌2008年に三越と伊勢丹が続いた。高島屋は1991年に[35年越しの新宿への旗艦店出店を決め](/tse/8233/decisions/shinjuku-store-1991/)、日本橋と二核で東京のシェアを広げている。そごう・西武はセブン&アイの下で非中核となり、2023年に[投資ファンドへ譲渡された](/tse/8243/decisions/sogo-seibu-sale-fortress-2023/)。立地の数を減らしても、都心の一店に集まる購買が全体を支える構造へ変わった。"
    }
  ],
  "profile": [
    {
      "key": "founding_business",
      "label": "祖業",
      "value": "百貨店"
    },
    {
      "key": "current_issue",
      "label": "現在の注力課題",
      "value": "高感度上質消費の深耕と識別顧客の拡大",
      "tags": [
        "顧客基盤拡大",
        "高付加価値化"
      ]
    }
  ],
  "lineage": {
    "title": "三越と伊勢丹の合流まで",
    "path": "3099-lineage-top.v2.json"
  },
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