{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "ykk",
  "company_name": "YKK",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/ykk/",
  "api_url": "/api/ykk/timeline.json",
  "updated": "2026-08-05",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/ykk/",
  "source": {
    "primary": [
      "有価証券報告書",
      "日本経済新聞「私の履歴書」1977年8月",
      "週刊東洋経済 2003年8月2日号"
    ],
    "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": "1934/1",
      "importance": 3,
      "event": "吉田忠雄氏がファスナーを商うサンエス商会を東京日本橋に創業",
      "source": "有価証券報告書"
    },
    {
      "date": "1945/8",
      "importance": 2,
      "event": "吉田工業に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1946/1",
      "importance": 2,
      "event": "商標YKKの制定",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/12",
      "importance": 3,
      "event": "米国製の高速自動植え付け機4台の輸入許可を取得",
      "source": "日本経済新聞「私の履歴書」1977年8月",
      "link": "/tse/ykk/decisions/chain-machine-import-1949/"
    },
    {
      "date": "1954/10",
      "importance": 2,
      "event": "黒部工場の着工（1955年5月稼動）",
      "source": "有価証券報告書"
    },
    {
      "date": "1957/7",
      "importance": 2,
      "event": "販売会社の吉田商事（現YKK AP）を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1957/10",
      "importance": 1,
      "event": "生地工場（現黒部工場）の着工",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/11",
      "importance": 3,
      "event": "生地工場にアルミ合金押出機を設置しアルミサッシの生産を開始",
      "source": "日本経済新聞「私の履歴書」1977年8月",
      "link": "/tse/ykk/decisions/aluminum-sash-entry-1959/"
    },
    {
      "date": "1959/12",
      "importance": 2,
      "event": "ニュージーランドに初の海外子会社を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/11",
      "importance": 2,
      "event": "生地工場でアルミ建材の製造を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1963/6",
      "importance": 1,
      "event": "本社を東京都千代田区へ移転",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/6",
      "importance": 1,
      "event": "建材専用の四国工場を着工",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/6",
      "importance": 1,
      "event": "建材専用の東北工場を着工",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/10",
      "importance": 1,
      "event": "建材専用の九州工場を着工",
      "source": "有価証券報告書"
    },
    {
      "date": "1976/5",
      "importance": 1,
      "event": "YKKインダストリーズ・シンガポールを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1979/8",
      "importance": 2,
      "event": "豪州のアルミ製錬事業ボインスメルターズへ参画",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/9",
      "importance": 2,
      "event": "米国子会社を統括するYKKコーポレーションを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1988/12",
      "importance": 2,
      "event": "欧州子会社を統括するYKKヨーロッパを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1991/12",
      "importance": 2,
      "event": "アジア子会社を統括するYKKホールディング・アジアを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/8",
      "importance": 2,
      "event": "YKKに商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2001/10",
      "importance": 1,
      "event": "吉田不動産（現YKK不動産）を完全子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/10",
      "importance": 3,
      "event": "株式交換によるYKK APの完全子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/12",
      "importance": 1,
      "event": "中国にYKK中国投資社を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/12",
      "importance": 1,
      "event": "蘇州YKK工機を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/2",
      "importance": 1,
      "event": "新設分割によるYKKファスニングプロダクツ販売の設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/4",
      "importance": 1,
      "event": "新設分割によるYKKビジネスサポートの設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/8",
      "importance": 3,
      "event": "株式を公開せず社員株主を続ける方針を表明",
      "source": "週刊東洋経済 2003年8月2日号",
      "link": "/tse/ykk/decisions/unlisted-employee-ownership-2003/"
    }
  ]
}