{
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  "stock_code": "6622",
  "company_name": "ダイヘン",
  "content_lang": "ja",
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  "updated": "2026-08-14",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6622/",
  "source": {
    "primary": [
      "有価証券報告書",
      "ダイヤモンド会社産業総覧1964年版"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
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  "timeline": [
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      "date": "1919/12",
      "importance": 3,
      "event": "大阪変圧器を設立し柱上用変圧器の生産開始",
      "source": "有価証券報告書"
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      "date": "1930/7",
      "importance": 1,
      "event": "工場を現在地に移転",
      "source": "有価証券報告書"
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    {
      "date": "1931/12",
      "importance": 1,
      "event": "ネオン変圧器の生産開始",
      "source": "ダイヤモンド会社産業総覧1964年版"
    },
    {
      "date": "1934/3",
      "importance": 3,
      "event": "電気溶接機の生産開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1939/4",
      "importance": 2,
      "event": "東京工場を開設し無線通信機の製造開始",
      "source": "ダイヤモンド会社産業総覧1964年版"
    },
    {
      "date": "1941/11",
      "importance": 1,
      "event": "酉島変圧器を合併",
      "source": "ダイヤモンド会社産業総覧1964年版"
    },
    {
      "date": "1944/11",
      "importance": 2,
      "event": "東京工場を分離し三鷹無線工業へ譲渡",
      "source": "ダイヤモンド会社産業総覧1964年版"
    },
    {
      "date": "1945/8",
      "importance": 2,
      "event": "終戦により京城・京都・池田の各工場を閉鎖",
      "source": "ダイヤモンド会社産業総覧1964年版"
    },
    {
      "date": "1953/11",
      "importance": 1,
      "event": "大阪証券取引所に株式上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/9",
      "importance": 1,
      "event": "神戸製鋼所との共同出資で阪神熔接機材を設立",
      "source": "ダイヤモンド会社産業総覧1964年版"
    },
    {
      "date": "1959/10",
      "importance": 1,
      "event": "九州電力との共同出資で九州変圧器を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1960/9",
      "importance": 1,
      "event": "福岡証券取引所に株式上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/5",
      "importance": 2,
      "event": "事業部制を採用",
      "source": "ダイヤモンド会社産業総覧1964年版"
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    {
      "date": "1961/7",
      "importance": 2,
      "event": "大阪府摂津市に溶接機工場が完成",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/10",
      "importance": 1,
      "event": "東京証券取引所に株式上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1965/5",
      "importance": 1,
      "event": "関電兼平製作所と合併",
      "source": "有価証券報告書"
    },
    {
      "date": "1967/12",
      "importance": 1,
      "event": "千歳工場が完成",
      "source": "有価証券報告書"
    },
    {
      "date": "1973/11",
      "importance": 2,
      "event": "三重工場が完成し超高圧大容量変圧器の生産開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1980/5",
      "importance": 3,
      "event": "アーク溶接用コンピューターロボットの生産開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1985/12",
      "importance": 3,
      "event": "ダイヘンに商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1986/7",
      "importance": 1,
      "event": "決算期を3月31日に変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/8",
      "importance": 1,
      "event": "タイに変圧器の合弁会社を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1996/5",
      "importance": 1,
      "event": "米国にDAIHEN Advanced Componentを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1997/11",
      "importance": 1,
      "event": "中国に牡丹江OTC溶接機を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/4",
      "importance": 1,
      "event": "タイの合弁を解消し全株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/11",
      "importance": 1,
      "event": "大阪電気を買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/10",
      "importance": 2,
      "event": "六甲事業所が完成し摂津事業所を閉鎖",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/2",
      "importance": 1,
      "event": "スロベニアのVARSTROJを買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/7",
      "importance": 1,
      "event": "中国電機製造を子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所プライム市場へ移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/10",
      "importance": 1,
      "event": "東北電機製造を子会社化",
      "source": "有価証券報告書"
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      "date": "2023/12",
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      "event": "四変テックの株式を追加取得し子会社化",
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      "date": "2024/1",
      "importance": 2,
      "event": "ドイツのLorch Schweisstechnikを買収",
      "source": "有価証券報告書"
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      "date": "2024/10",
      "importance": 2,
      "event": "東京本社を設置し二本社制へ移行",
      "source": "有価証券報告書"
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}