{ "spec_version": "5", "endpoint": "history", "stock_code": "8334", "company_name": "群馬銀行", "content_lang": "ja", "meta_lang": "en", "canonical_url": "https://the-shashi.com/tse/8334/decisions/", "api_url": "/api/8334/history.json", "updated": "2026-10-13", "license": "© 2026 Yutaka Sugiura. All rights reserved.", "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/8334/decisions/", "source": { "long_term": { "primary": [ "有価証券報告書" ], "extraction": "EDINET の XBRL、旧有価証券報告書、会社年鑑・社史等からの転記", "row_field": "reference", "caveat": "創業期から現在までを 1 本に繋いだ長期系列のため、年代により出所・単位・連結範囲が変わる。行ごとの reference / unit / consolidation を必ず参照すること" } }, "title": "群馬銀行の歴史概略", "eras": [ { "title": "第三十九国立銀行の設立と三十九銀行への改称", "start_year": 1878, "end_year": 1910, "phase": "founding" }, { "title": "昭和恐慌下の群馬県内銀行", "start_year": 1911, "end_year": 1931 }, { "title": "群馬大同銀行の誕生と前橋空襲による本社焼失", "start_year": 1932, "end_year": 1954, "phase": "founding" }, { "title": "群馬銀行への改称と東証上場", "start_year": 1955, "end_year": 1989, "phase": "growth" }, { "title": "信託・投信の窓口販売と第四北越フィナンシャルグループとの経営統合", "start_year": 1990, "end_year": 2026, "phase": "transformation" } ], "lineage": { "path": "8334-lineage-top.v3.json" }, "timelineLead": "1878年に設立された第三十九国立銀行が起源。\n1932年に群馬大同銀行として県内の銀行を統合し、1964年には群馬県の指定金融機関に指定された。群馬県を地盤とする地方銀行で、第四北越フィナンシャルグループとの経営統合を予定している。", "lineageLead": "1878年に設立された第三十九国立銀行が前身である。\n1932年に設立された群馬県金融が群馬大同銀行へ改称し、旧群馬銀行と上州銀行を吸収合併した。1955年に群馬銀行へ商号を改め、2025年に第四北越フィナンシャルグループと経営統合で基本合意しており、県境を越えた地銀再編の当事者である。", "long_term": [ { "year": 1969, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1970, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1971, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1972, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1973, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1974, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1975, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1976, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1977, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1978, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1979, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1980, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1981, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1982, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1983, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1984, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1985, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1986, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1987, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1988, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1989, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1990, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1991, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1992, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1993, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1994, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1995, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1996, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1997, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1998, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1999, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 2000, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 2001, "month": 3, "company_name": "群馬銀行", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 2002, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1583, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": -345, "net_profit_jp": "当期純利益", "net_profit": -210, "net_margin": -13.266, "employees": null, "reference": null }, { "year": 2003, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1466, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 76, "net_profit_jp": "当期純利益", "net_profit": 34, "net_margin": 2.319, "employees": null, "reference": null }, { "year": 2004, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1372, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 162, "net_profit_jp": "当期純利益", "net_profit": 134, "net_margin": 9.766, "employees": null, "reference": null }, { "year": 2005, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1410, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 99, "net_profit_jp": "当期純利益", "net_profit": 52, "net_margin": 3.687, "employees": null, "reference": null }, { "year": 2006, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1417, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 353, "net_profit_jp": "当期純利益", "net_profit": 160, "net_margin": 11.291, "employees": null, "reference": null }, { "year": 2007, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1644, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 425, "net_profit_jp": "当期純利益", "net_profit": 191, "net_margin": 11.618, "employees": null, "reference": null }, { "year": 2008, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1563, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 363, "net_profit_jp": "当期純利益", "net_profit": 206, "net_margin": 13.179, "employees": null, "reference": null }, { "year": 2009, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1483, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 158, "net_profit_jp": "当期純利益", "net_profit": 110, "net_margin": 7.417, "employees": null, "reference": null }, { "year": 2010, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1418, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 312, "net_profit_jp": "当期純利益", "net_profit": 182, "net_margin": 12.834, "employees": null, "reference": null }, { "year": 2011, "month": 3, "company_name": "群馬銀行", "consolidation": "連結", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "経常収益", "sales": 1359, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 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