{
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  "company_name": "明電舎",
  "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/6508/",
  "source": {
    "primary": [
      "有価証券報告書",
      "ダイヤモンド会社産業総覧 1964年版"
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    "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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    {
      "date": "1897/12",
      "importance": 3,
      "event": "個人経営の電気機械工場として発足",
      "source": "有価証券報告書"
    },
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      "date": "1912/2",
      "importance": 1,
      "event": "大崎工場を創設",
      "source": "有価証券報告書"
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    {
      "date": "1917/6",
      "importance": 2,
      "event": "個人経営を資本金2,000千円の株式会社に組織変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1935/10",
      "importance": 1,
      "event": "名古屋工場を創設",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/5",
      "importance": 2,
      "event": "東京・大阪・名古屋の各証券取引所に株式を上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1955/1",
      "importance": 3,
      "event": "西独AEG社と空気吹付しゃ断器・変圧器などで技術提携",
      "source": "ダイヤモンド会社産業総覧 1964年版"
    },
    {
      "date": "1961/4",
      "importance": 1,
      "event": "沼津工場を創設",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/6",
      "importance": 2,
      "event": "スウェーデンASEA社とタービン発電機・励磁機で技術提携",
      "source": "ダイヤモンド会社産業総覧 1964年版"
    },
    {
      "date": "1966/6",
      "importance": 2,
      "event": "THAI MEIDENSHA CO., LTD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1977/4",
      "importance": 1,
      "event": "太田工場を創設",
      "source": "有価証券報告書"
    },
    {
      "date": "1987/6",
      "importance": 1,
      "event": "英文社名をMEIDENSHA CORPORATIONに変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1995/2",
      "importance": 1,
      "event": "本社事務所を東京都中央区に移転",
      "source": "有価証券報告書"
    },
    {
      "date": "2000/7",
      "importance": 2,
      "event": "日立製作所・富士電機との開発合弁会社ジャパンモータアンドジェネレータを設立",
      "source": "有価証券報告書"
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    {
      "date": "2001/7",
      "importance": 2,
      "event": "日立製作所・富士電機との製造合弁会社日本AEパワーシステムズを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/5",
      "importance": 1,
      "event": "甲府工場を創設",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/10",
      "importance": 3,
      "event": "変圧器・遮断器・開閉装置など変電事業を日本AEパワーシステムズに会社分割",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/4",
      "importance": 2,
      "event": "明電エンジニアリングを吸収合併",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/8",
      "importance": 1,
      "event": "札幌証券取引所・福岡証券取引所への株式上場を廃止",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/12",
      "importance": 1,
      "event": "MEIDEN HANGZHOU DRIVE SYSTEMS CO., LTD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/9",
      "importance": 2,
      "event": "大崎工場跡地にThinkPark Towerを完成させ、本社を移転",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/10",
      "importance": 1,
      "event": "沼津事業所隣地に旧ジヤトコ沼津工場の土地・建物を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/4",
      "importance": 3,
      "event": "日本AEパワーシステムズとの合弁事業を解消",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/4",
      "importance": 2,
      "event": "明電T&Dを吸収合併",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/10",
      "importance": 1,
      "event": "保守・サービス事業を明電エンジニアリングなど4社に吸収分割",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/3",
      "importance": 2,
      "event": "インドのPrime Electric社に資本参加",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/6",
      "importance": 2,
      "event": "独TRIDELTA GmbHからTRIDELTA社を買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/6",
      "importance": 1,
      "event": "PRIME MEIDEN LIMITEDの株式を追加取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/5",
      "importance": 1,
      "event": "MEIDEN (HANGZHOU) DRIVE TECHNOLOGY CO., LTD.を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/6",
      "importance": 1,
      "event": "イームル工業を連結子会社化",
      "source": "有価証券報告書"
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    {
      "date": "2021/4",
      "importance": 1,
      "event": "ベトナムのVietstar Industry Corporationの過半株式を取得",
      "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に移行",
      "source": "有価証券報告書"
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}