{ "spec_version": "4", "endpoint": "history", "stock_code": "1893", "company_name": "五洋建設", "content_lang": "ja", "meta_lang": "en", "canonical_url": "https://the-shashi.com/tse/1893/decisions/", "api_url": "/api/1893/history.json", "updated": "2026-09-26", "license": "© 2026 Yutaka Sugiura. All rights reserved.", "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/1893/decisions/", "source": { "long_term": { "primary": [ "会社年鑑（1976年版）", "会社年鑑（1986年版）", "有価証券報告書", "会社年鑑（1967年版）", "会社年鑑（1963年版）" ], "extraction": "EDINET の XBRL、kabupro 掲載の旧有価証券報告書、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": "五洋建設の歴史概略", "eras": [ { "title": "水野甚次郎が広島で興した水野組と、港湾工事の請負で固めた地盤", "start_year": 1896, "end_year": 1935 }, { "title": "浚渫船の建造と戦後の港湾再建、株式会社化とスエズ運河工事、上場", "start_year": 1936, "end_year": 1963 }, { "title": "東京移転と五洋建設への改称、合併で陸上土木・建築に広げた総合建設業", "start_year": 1964, "end_year": 1996 }, { "title": "シンガポールの大型埋立と羽田D滑走路、海外本社機能の移転と洋上風力", "start_year": 1997, "end_year": 2026 } ], "summary": { "description": "五洋建設（旧水野組）の歴史。1896年、水野甚次郎氏が広島県呉市で水野組を創設し港湾土木と埋立浚渫を手がける。浚渫船「安芸」、スエズ運河改修工事、羽田空港D滑走路までの沿革と経緯を執筆。" }, "long_term": [ { "year": 1950, "month": 3, "company_name": "五洋建設", "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": 1951, "month": 3, "company_name": "五洋建設", "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": 1952, "month": 3, "company_name": "五洋建設", "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": 1953, "month": 3, "company_name": "五洋建設", "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": 1954, "month": 3, "company_name": "五洋建設", "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": 1955, "month": 3, "company_name": "五洋建設", "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": 1956, "month": 3, "company_name": "五洋建設", "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": 1957, "month": 3, "company_name": "五洋建設", "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": 1958, "month": 3, "company_name": "五洋建設", "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": 1959, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 29, "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": "会社年鑑（1963年版）" }, { "year": 1960, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 43, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 4, "net_margin": 9.302, "employees": null, "reference": "会社年鑑（1967年版）" }, { "year": 1961, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 74, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 5, "net_margin": 6.756, "employees": null, "reference": "会社年鑑（1967年版）" }, { "year": 1962, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 87, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 6, "net_margin": 6.896, "employees": null, "reference": "会社年鑑（1967年版）" }, { "year": 1963, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 146, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 9, "net_margin": 6.164, "employees": null, "reference": "会社年鑑（1967年版）" }, { "year": 1964, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 197, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 10, "net_margin": 5.076, "employees": null, "reference": "会社年鑑（1967年版）" }, { "year": 1965, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 202, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 3, "net_margin": 1.485, "employees": null, "reference": "会社年鑑（1967年版）" }, { "year": 1966, "month": 3, "company_name": "水野組", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 182, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 2, "net_profit_jp": "当期純利益", "net_profit": 2, "net_margin": 1.098, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1967, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 186, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 5, "net_profit_jp": "当期純利益", "net_profit": 3, "net_margin": 1.612, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1968, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 250, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 7, "net_profit_jp": "当期純利益", "net_profit": 3, "net_margin": 1.2, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1969, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 400, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 15, "net_profit_jp": "当期純利益", "net_profit": 7, "net_margin": 1.75, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1970, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 505, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 25, "net_profit_jp": "当期純利益", "net_profit": 11, "net_margin": 2.178, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1971, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 653, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 36, "net_profit_jp": "当期純利益", "net_profit": 18, "net_margin": 2.756, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1972, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 809, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 40, "net_profit_jp": "当期純利益", "net_profit": 21, "net_margin": 2.595, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1973, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1143, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 55, "net_profit_jp": "当期純利益", "net_profit": 27, "net_margin": 2.362, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1974, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1381, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 54, "net_profit_jp": "当期純利益", "net_profit": 28, "net_margin": 2.027, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1975, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1941, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 50, "net_profit_jp": "当期純利益", "net_profit": 25, "net_margin": 1.287, "employees": null, "reference": "会社年鑑（1976年版）" }, { "year": 1976, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1763, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 21, "net_profit_jp": "当期純利益", "net_profit": 5, "net_margin": 0.283, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1977, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1692, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 37, "net_profit_jp": "当期純利益", "net_profit": 18, "net_margin": 1.063, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1978, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1832, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 42, "net_profit_jp": "当期純利益", "net_profit": 19, "net_margin": 1.037, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1979, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2031, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 51, "net_profit_jp": "当期純利益", "net_profit": 20, "net_margin": 0.984, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1980, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2117, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 53, "net_profit_jp": "当期純利益", "net_profit": 20, "net_margin": 0.944, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1981, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2130, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 44, "net_profit_jp": "当期純利益", "net_profit": 17, "net_margin": 0.798, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1982, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2648, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 78, "net_profit_jp": "当期純利益", "net_profit": 13, "net_margin": 0.49, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1983, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2589, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 72, "net_profit_jp": "当期純利益", "net_profit": 21, "net_margin": 0.811, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1984, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2336, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 29, "net_profit_jp": "当期純利益", "net_profit": 8, "net_margin": 0.342, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1985, "month": 3, "company_name": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 2741, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 9, "net_profit_jp": "当期純利益", "net_profit": 0, "net_margin": 0, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1986, "month": 3, "company_name": "五洋建設", "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": "五洋建設", "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": "五洋建設", "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": "五洋建設", "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": "五洋建設", "consolidation": "単体", "accounting_standard": "JGAAP", 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