{ "spec_version": "4", "endpoint": "history", "stock_code": "5451", "company_name": "ヨドコウ", "content_lang": "ja", "meta_lang": "en", "canonical_url": "https://the-shashi.com/tse/5451/decisions/", "api_url": "/api/5451/history.json", "updated": "2026-10-01", "license": "© 2026 Yutaka Sugiura. All rights reserved.", "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/5451/decisions/", "source": { "long_term": { "primary": [ "会社年鑑（1986年版）", "会社年鑑（1976年版）半期合算", "会社年鑑（1963年版）半期合算", "会社年鑑（1967年版）半期合算", "会社年鑑（1971年版）半期合算", "上場会社総覧（1956年版）半期合算", "上場会社総覧（1959年版）半期合算" ], "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": "ヨドコウの歴史概略", "eras": [ { "title": "淀川製鋼所の設立と溶融亜鉛めっき鋼板の製造開始", "start_year": 1935, "end_year": 1963, "phase": "founding" }, { "title": "カラー鋼板とヨド物置によるエクステリア商品への多角化", "start_year": 1964, "end_year": 1985, "phase": "stable_growth" }, { "title": "ガルバリウム鋼板の製造と台湾の盛餘の子会社化", "start_year": 1986, "end_year": 2006, "phase": "stable_growth" }, { "title": "ホテル事業からの撤退とヨドコウへの改称", "start_year": 2007, "end_year": 2026, "phase": "transformation" } ], "timelineLead": "1935年に大阪市で鋼板・鋼材の製造を目的に設立された淀川製鋼所が起源。\n1964年にカラー鋼板の製造を始め、1986年にはガルバリウム鋼板の製造を開始した。めっき鋼板・カラー鋼板とエクステリア商品を主力とし、台湾の盛餘を傘下に持つ鋼板メーカーである。", "summary": { "description": "ヨドコウ（旧淀川製鋼所）の歴史。1935年、大阪市に鋼板・鋼材の製造を目的として淀川製鋼所を設立。溶融亜鉛めっき鋼板とカラー鋼板、エクステリア事業への展開、2025年のヨドコウへの商号変更までの沿革と経緯を執筆。" }, "long_term": [ { "year": 1950, "month": 3, "company_name": "淀川製鋼所", "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": "淀川製鋼所", "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": "淀川製鋼所", "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": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 44, "operating_profit_jp": "営業利益", "operating_profit": 4, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 3, "net_margin": 6.818, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1954, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 43, "operating_profit_jp": "営業利益", "operating_profit": 3, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 3, "net_margin": 6.976, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1955, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 47, "operating_profit_jp": "営業利益", "operating_profit": 4, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 2, "net_margin": 4.255, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1956, "month": 3, "company_name": "淀川製鋼所", "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": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 90, "operating_profit_jp": "営業利益", "operating_profit": 11, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": "上場会社総覧（1959年版）半期合算" }, { "year": 1958, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 122, "operating_profit_jp": "営業利益", "operating_profit": 9, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": "上場会社総覧（1959年版）半期合算" }, { "year": 1959, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 101, "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）半期合算" }, { "year": 1960, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 129, "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）半期合算" }, { "year": 1961, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 174, "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）半期合算" }, { "year": 1962, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 185, "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）半期合算" }, { "year": 1963, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 144, "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": 2.777, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1964, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 162, "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": 2.469, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1965, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 173, "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": 1.734, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1966, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 191, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 2, "net_margin": 1.047, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1967, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 216, "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": 4.166, "employees": null, "reference": "会社年鑑（1971年版）半期合算" }, { "year": 1968, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 251, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 11, "net_margin": 4.382, "employees": null, "reference": "会社年鑑（1971年版）半期合算" }, { "year": 1969, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 265, "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": 3.773, "employees": null, "reference": "会社年鑑（1971年版）半期合算" }, { "year": 1970, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 312, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 15, "net_margin": 4.807, "employees": null, "reference": "会社年鑑（1971年版）半期合算" }, { "year": 1971, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 352, "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": 13, "net_margin": 3.693, "employees": null, "reference": "会社年鑑（1976年版）半期合算" }, { "year": 1972, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 388, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 17, "net_profit_jp": "当期純利益", "net_profit": 8, "net_margin": 2.061, "employees": null, "reference": "会社年鑑（1976年版）半期合算" }, { "year": 1973, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 495, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 24, "net_profit_jp": "当期純利益", "net_profit": 12, "net_margin": 2.424, "employees": null, "reference": "会社年鑑（1976年版）半期合算" }, { "year": 1974, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 693, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 57, "net_profit_jp": "当期純利益", "net_profit": 28, "net_margin": 4.04, "employees": null, "reference": "会社年鑑（1976年版）半期合算" }, { "year": 1975, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 834, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 79, "net_profit_jp": "当期純利益", "net_profit": 38, "net_margin": 4.556, "employees": null, "reference": "会社年鑑（1976年版）半期合算" }, { "year": 1976, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 757, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 8, "net_profit_jp": "当期純利益", "net_profit": 16, "net_margin": 2.113, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1977, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 921, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 24, "net_profit_jp": "当期純利益", "net_profit": 12, "net_margin": 1.302, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1978, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 909, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 1, "net_profit_jp": "当期純利益", "net_profit": 3, "net_margin": 0.33, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1979, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 942, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 22, "net_profit_jp": "当期純利益", "net_profit": 10, "net_margin": 1.061, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1980, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1109, "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": 36, "net_margin": 3.246, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1981, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1186, "operating_profit_jp": "営業利益", "operating_profit": 96.2, "ordinary_profit_jp": "経常利益", "ordinary_profit": 68, "net_profit_jp": "当期純利益", "net_profit": 38, "net_margin": 3.204, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1982, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1209, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 41, "net_profit_jp": "当期純利益", "net_profit": 25, "net_margin": 2.067, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1983, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1310, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 47, "net_profit_jp": "当期純利益", "net_profit": 21, "net_margin": 1.603, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1984, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1347, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 47, "net_profit_jp": "当期純利益", "net_profit": 27, "net_margin": 2.004, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 1985, "month": 3, "company_name": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 1471, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": "経常利益", "ordinary_profit": 75, "net_profit_jp": "当期純利益", "net_profit": 32, "net_margin": 2.175, "employees": null, "reference": "会社年鑑（1986年版）" }, { "year": 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"net_profit_jp": null, "net_profit": null, "net_margin": null, "employees": null, "reference": null }, { "year": 1989, "month": 3, "company_name": "淀川製鋼所", "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": "淀川製鋼所", "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": "淀川製鋼所", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": null, "sales": null, 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