{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "6326",
  "company_name": "クボタ",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/6326/",
  "api_url": "/api/6326/timeline.json",
  "updated": "2026-09-04",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6326/",
  "source": {
    "primary": [
      "有価証券報告書"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
    "row_field": "source"
  },
  "timeline": [
    {
      "date": "1890/2",
      "importance": 1,
      "event": "久保田鉄工所を創業",
      "source": null
    },
    {
      "date": "1893/7",
      "importance": 2,
      "event": "水道用鋳鉄管の製造を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1917",
      "importance": 1,
      "event": "工作機械に参入・鋳鉄管生産を尼崎と恩加島に移管",
      "source": null
    },
    {
      "date": "1919/11",
      "importance": 2,
      "event": "実用自動車製造を設立・自動車に参入",
      "source": null
    },
    {
      "date": "1922/2",
      "importance": 2,
      "event": "発動機（農工用小型エンジン）の製造を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1927/2",
      "importance": 1,
      "event": "隅田川精鉄所を買収",
      "source": null
    },
    {
      "date": "1930/12",
      "importance": 1,
      "event": "久保田鉄工所を設立",
      "source": null
    },
    {
      "date": "1937/11",
      "importance": 1,
      "event": "農工用発動機の大量生産を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1947/5",
      "importance": 2,
      "event": "耕うん機の製造開始・農機に参入",
      "source": null
    },
    {
      "date": "1949/5",
      "importance": 1,
      "event": "東京証券取引所に株式上場",
      "source": null
    },
    {
      "date": "1950",
      "importance": 1,
      "event": "小田原大造氏が社長就任",
      "source": null
    },
    {
      "date": "1953/6",
      "importance": 1,
      "event": "社名を久保田鉄工に変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1954/4",
      "importance": 1,
      "event": "合成樹脂管の製造を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1957/11",
      "importance": 1,
      "event": "住宅建材事業に参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/11",
      "importance": 1,
      "event": "創業者・久保田権四郎氏が逝去",
      "source": null
    },
    {
      "date": "1960/3",
      "importance": 3,
      "event": "中型トラクターの販売開始",
      "source": null,
      "link": "/tse/6326/decisions/farm-machinery-mainstay-1960/"
    },
    {
      "date": "1961/5",
      "importance": 1,
      "event": "環境事業に参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1962/5",
      "importance": 1,
      "event": "産業機械・鋳鋼製品の量産体制を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1967/1",
      "importance": 1,
      "event": "住宅建材事業に本格参入",
      "source": "有価証券報告書"
    },
    {
      "date": "1969/5",
      "importance": 1,
      "event": "田植機・バインダーの量産体制を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1972/6",
      "importance": 2,
      "event": "欧米向けトラクタの量産を開始",
      "source": null
    },
    {
      "date": "1972/9",
      "importance": 3,
      "event": "クボタトラクター Corp.を設立",
      "source": "有価証券報告書",
      "link": "/tse/6326/decisions/north-america-tractor-export-1972/"
    },
    {
      "date": "1974/3",
      "importance": 1,
      "event": "ヨーロッパクボタトラクタ販売を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1975/8",
      "importance": 1,
      "event": "農業用トラクタの専門量産工場として筑波工場を新設",
      "source": "有価証券報告書"
    },
    {
      "date": "1976/11",
      "importance": 1,
      "event": "ニューヨーク証券取引所に上場。（2013年7月に同取引所上場廃止。）",
      "source": "有価証券報告書"
    },
    {
      "date": "1980/4",
      "importance": 1,
      "event": "外壁材専門工場として鹿島工場を新設",
      "source": "有価証券報告書"
    },
    {
      "date": "1985/1",
      "importance": 1,
      "event": "エンジン専門工場として堺製造所に堺臨海工場を新設",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/4",
      "importance": 3,
      "event": "商号をクボタに変更",
      "source": null,
      "link": "/tse/6326/decisions/parachute-diversification-1990/"
    },
    {
      "date": "1994/3",
      "importance": 1,
      "event": "子会社を解散",
      "source": null
    },
    {
      "date": "1999/3",
      "importance": 2,
      "event": "約30年来の水道管カルテルが発覚",
      "source": null
    },
    {
      "date": "1999/12",
      "importance": 1,
      "event": "希望退職者を募集",
      "source": null
    },
    {
      "date": "2003/12",
      "importance": 1,
      "event": "非注力事業を分離縮小",
      "source": null
    },
    {
      "date": "2005/4",
      "importance": 1,
      "event": "シーアイ化成との合成樹脂管事業統合によりクボタシーアイを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/6",
      "importance": 3,
      "event": "アスベストが社会問題化",
      "source": null,
      "link": "/tse/6326/decisions/asbestos-disclosure-2005/"
    },
    {
      "date": "2007/6",
      "importance": 1,
      "event": "立ち入り調査が相次ぐ",
      "source": null
    },
    {
      "date": "2007/9",
      "importance": 1,
      "event": "サイアムクボタトラクター Co.,Ltd.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/3",
      "importance": 2,
      "event": "ノルウェーKverneland ASAを買収",
      "source": null
    },
    {
      "date": "2013/12",
      "importance": 1,
      "event": "クボタファームマシナリーヨーロッパ S.A.S.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/7",
      "importance": 1,
      "event": "GPを買収",
      "source": null
    },
    {
      "date": "2019/12",
      "importance": 1,
      "event": "基幹システムの刷新開始",
      "source": null
    },
    {
      "date": "2022/4",
      "importance": 3,
      "event": "Escortsを買収",
      "source": null,
      "link": "/tse/6326/decisions/escorts-india-acquisition-2022/"
    },
    {
      "date": "2022/9",
      "importance": 1,
      "event": "グローバル技術研究所を新設",
      "source": "有価証券報告書"
    }
  ]
}