{
  "spec_version": "3",
  "endpoint": "timeline",
  "stock_code": "3864",
  "company_name": "三菱製紙",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/3864/",
  "api_url": "/api/3864/timeline.json",
  "updated": "2026-08-23",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/3864/",
  "source": {
    "primary": [
      "有価証券報告書",
      "三菱製紙 公式サイト 沿革"
    ],
    "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": "1898/4",
      "importance": 2,
      "event": "神戸製紙所を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1901/6",
      "importance": 1,
      "event": "工場を移転",
      "source": "有価証券報告書"
    },
    {
      "date": "1902/12",
      "importance": 2,
      "event": "上質紙「金菱」の製造を開始",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1904/6",
      "importance": 1,
      "event": "三菱製紙所に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1917/2",
      "importance": 2,
      "event": "中川工場を新設",
      "source": "有価証券報告書"
    },
    {
      "date": "1917/11",
      "importance": 1,
      "event": "株式会社に組織変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1917/11",
      "importance": 1,
      "event": "三菱製紙に商号変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1918/3",
      "importance": 2,
      "event": "アート紙の製造を開始",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1925/12",
      "importance": 1,
      "event": "本社を移転",
      "source": "有価証券報告書"
    },
    {
      "date": "1935/6",
      "importance": 2,
      "event": "バライタ原紙の製造を開始",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1944/4",
      "importance": 2,
      "event": "京都写真工業を吸収合併",
      "source": "有価証券報告書"
    },
    {
      "date": "1944/8",
      "importance": 1,
      "event": "浪速製紙を吸収合併",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/5",
      "importance": 1,
      "event": "東京・大阪の各証券取引所に上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1950/7",
      "importance": 2,
      "event": "印画紙「月光V」を発売",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1962/6",
      "importance": 2,
      "event": "National Cash Register Co.と業務提携",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1965/4",
      "importance": 2,
      "event": "三菱カラー印画紙を発売",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1966/4",
      "importance": 2,
      "event": "八戸工場を新設",
      "source": "有価証券報告書"
    },
    {
      "date": "1966/4",
      "importance": 3,
      "event": "白河パルプ工業と合併",
      "source": "有価証券報告書"
    },
    {
      "date": "1966/12",
      "importance": 1,
      "event": "浪速工場を閉鎖",
      "source": "有価証券報告書"
    },
    {
      "date": "1974/7",
      "importance": 2,
      "event": "簡易製版印刷システム「三菱シルバーマスター」を発売",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "1999/1",
      "importance": 3,
      "event": "製紙会社2社の株式を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/3",
      "importance": 2,
      "event": "中川工場を閉鎖",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/8",
      "importance": 3,
      "event": "富士フイルムと写真事業で業務提携",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "2007/11",
      "importance": 2,
      "event": "王子製紙と情報用紙事業で業務提携",
      "source": "三菱製紙 公式サイト 沿革"
    },
    {
      "date": "2011/10",
      "importance": 2,
      "event": "KJ特殊紙を完全子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/3",
      "importance": 3,
      "event": "王子HDによる持分法適用会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "importance": 1,
      "event": "プライム市場に移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/9",
      "importance": 2,
      "event": "フレンスブルク工場を売却",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/3",
      "importance": 2,
      "event": "白河事業所を閉鎖",
      "source": "有価証券報告書"
    }
  ]
}