{ "spec_version": "4", "endpoint": "history", "stock_code": "4046", "company_name": "大阪ソーダ", "content_lang": "ja", "meta_lang": "en", "canonical_url": "https://the-shashi.com/tse/4046/decisions/", "api_url": "/api/4046/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/4046/decisions/", "source": { "chapters": { "html_url": "https://the-shashi.com/tse/4046/", "primary": [ "社史", "有価証券報告書", "新聞・雑誌記事" ], "extraction": "一次資料を読み合わせて執筆" }, "long_term": { "primary": [ "会社年鑑（1986年版）", "上場会社総覧（1956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", "会社年鑑（1976年版）半期合算", "会社年鑑（1976年版・1986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": "大阪ソーダの歴史概略", "eras": [ { "title": "関西財界有志の大阪曹達設立と小倉・尼崎工場の建設", "start_year": 1915, "end_year": 1948, "phase": "founding" }, { "title": "松山工場のダップ樹脂による石油化学への参入", "start_year": 1949, "end_year": 1970, "phase": "stable_growth" }, { "title": "水島工場でのエピクロルヒドリン製造とダイソーへの改称", "start_year": 1971, "end_year": 2007, "phase": "stable_growth" }, { "title": "サンヨーファイン買収による医薬品原薬への進出と全固体電池の開発", "start_year": 2008, "end_year": 2026, "phase": "maturity" } ], "overview": [ { "label": "創業", "text": "1915年11月、関西財界の有力者が大阪で大阪曹達を設立した。資本金は75万円で、創立委員長には中橋徳五郎氏が就任した。発端は、関東州長官の白仁武氏が、屋外に積まれて雨にさらされた関東州の塩の使い道を持ちかけたことにある。関東都督府が研究を終えた水銀法による苛性ソーダの製造を民間が引き受けることになり、工場は原料塩を運び込みやすい小倉に置いた。その後、社名は1988年12月にダイソー、2015年10月に大阪ソーダへと改めた。" }, { "label": "決断", "text": "原料と製法を官から受け継ぎ、純度の高さで需要が来るのを待った会社である。創業時の製品は苛性ソーダと晒粉の2品目で、水銀法の高純度品を求める国内の需要家はまだ少なかった。その後、第一次世界大戦で輸入が途絶えると、1918年10月に資本金を200万円へ増やした。1923〜24年には人絹向けに次亜塩素酸ソーダと合成塩酸を加え、1931年11月には社内に積み上げた資本で尼崎工場を新設した。並行して電解槽の改良で大曹式水銀法を築き、同業数社へ実施権を供与した。" }, { "label": "現況", "text": "現在の最大の収益源は、売上の最も大きい基礎化学品ではなくヘルスケアである。2026年3月期の連結売上高は999億円、営業利益は176億円だった。セグメント別では、電解ソーダを含む基礎化学品が417億円と売上の4割強を占める。一方で、ヘルスケアは売上146億円に対して利益72億円を上げ、全セグメントで最も大きい利益を出した。基礎化学品の利益は2024年3月期に2億円まで落ち、2026年3月期に62億円へ戻っており、市況の振れを受けやすい。また、海外売上が全体の約4割を占めるため、為替と海外の需要にも業績が左右される。" }, { "label": "競合", "text": "汎用のソーダでは同業と同じ市況にさらされ、差は電解の下流で付けている。創業期の大阪曹達は水銀法の改良で先んじ、1931年からの約10年間に大曹式水銀法の実施権を同業数社へ供与した。しかし、苛性ソーダそのものは品質で差が付きにくく、基礎化学品の利益率は2024年3月期に1%を割り、2026年3月期も15%程度にとどまる。これに対して、ヘルスケアの利益率は約49%、機能化学品は約17%と高く、現在の競争優位は医薬や機能性材料など下流の製品が生んでいる。" } ], "profile": [ { "key": "founding_business", "label": "祖業", "value": "関東州の塩を原料とする水銀法の苛性ソーダ" }, { "key": "current_issue", "label": "現在の注力課題", "value": "医薬と全固体電池材料への事業領域の拡大", "tags": [ "研究開発", "多角化" ] } ], "timelineLead": "1915年に関西財界の有力者が大阪で設立した大阪曹達が起源。\n水銀法による苛性ソーダの製造を民間で引き受け、1931年からは大曹式水銀法の実施権を同業数社へ供与した。電解ソーダを祖業とする化学メーカーで、現在はヘルスケアが最大の利益を生み、海外売上が約4割を占める。", "foundingStory": true, "summary": { "description": "大阪ソーダ（旧大阪曹達）の歴史。1915年、関西財界有志がかせいソーダの製造販売を目的に大阪で設立。ダップ樹脂による石油化学参入、エピクロルヒドリンとシリカゲル、ダイソーからの社名戻しまでの沿革と経緯を執筆。" }, "chapters": [ { "start_year": 1915, "end_year": 1948, "main_title": "関西財界有志の大阪曹達設立と小倉・尼崎工場の建設", "subsections": [ { "title": "関東州の塩を電解する資本金75万円の大阪曹達と、水銀法の小倉工場", "text": "大阪曹達は1915年11月9日、資本金75万円で設立登記を済ませた。発端は、関東州の長官だった白仁武氏が、屋外に積まれて雨にさらされた関東州の塩を日本で生かす方法を中橋徳五郎氏に相談したことにあった。関東都督府はこの塩を原料に水銀法で苛性ソーダを製造する研究を終え、事業を民間の経営へ移す段階にあった。許可を受けた宗像祐太郎氏・長尾藤三氏・尼崎伊三郎氏らは、中橋徳五郎氏を委員長に据えて関西の有力者で会社を創立した。原料の塩と製造技術を官から一括して引き継げる条件が、大阪の財界人の出資を後押ししたとみられる。\n\n大阪曹達は関東州から運ぶ塩の輸送の便を考え、工場を小倉市に新設した。この工場は、日本で水銀法の電解ソーダ工業が始まった地点となった。水銀法は食塩水を電気分解する際に陰極へ水銀、陽極へ黒鉛を用い、陰極に鉄を使う隔膜法とは方式を異にする。1953年時点の説明では、得られる苛性ソーダは純度99%で、濃度45%以上の電解液を濃縮せず化学繊維の製造に使えた。ただし創業当初の製品は苛性ソーダと晒粉の2品目にとどまり、国内の需要家も水銀法の高純度品をまだ求めていなかった。小倉の立地は需要地よりも原料塩の搬入を優先した選択であり、高純度という特長が生きるまでには時間を要したと推察される。\n\n大正の初めまで、ソーダ類の国内供給は大半を輸入品が占めていた。第一次世界大戦が始まると、海外からのソーダ類の輸入が途絶えた。国内ではソーダを基礎原料とする化学工業が相次いで興り、国産品への需要が生まれた。大阪曹達は1918年10月に資本金を75万円から200万円へ増資し、設立から3年で資本を約2.7倍に拡大した。1923〜24年に人絹工業が台頭すると、大阪曹達は苛性ソーダと晒粉に加え、漂白用の次亜塩素酸ソーダと合成塩酸の製造を始めた。輸入の途絶が水銀法の国産ソーダに最初の需要をもたらし、増資の資金は小倉工場の設備拡張に充当されたと思われる。", "references": [ { "title": "証券 1953年（新規上場会社紹介）", "year": null, "month": null, "date": null, "url": null, "quotes": [] }, { "title": "会社銀行八十年史 1955年「大阪曹達」", "year": null, "month": null, "date": null, "url": null, "quotes": [] }, { "title": "企業の歴史（明治百年）1968年「大阪曹達」", "year": null, "month": null, "date": null, "url": null, "quotes": [] }, { "title": "人生問答 立花大亀対談集 第3集「田村太郎（大阪曹達社長）」", "year": null, "month": null, "date": null, "url": null, "quotes": [] } ], "start_year": 1915, "opinionPos": [ [ 254 ], [ 288 ], [ 272 ] ] }, { "title": "大正9年の恐慌を越えて人絹向けに建てた尼崎工場と、戦後の水害", "text": "大阪曹達は1931年11月、兵庫県尼崎市に2つ目の工場を新設した。それ以前の1920年には恐慌と欧米品の流入で市価が暴落し、大阪曹達は苦しい時期を経た。1923〜24年の人絹工業の台頭に続き、1927〜28年以降は人絹の生産が急増し、品質の優れた水銀法の苛性ソーダに需要が向かった。尼崎工場の建設資金には、それまで社内に積み上げてきた資本を充てた。1935年ころからはスフ工業も伸び、大阪曹達は小倉工場の能力拡大と尼崎の新設で供給力を高めた。創業時に国内で求められなかった高純度品が、人絹とスフの普及で競争優位に転じたと考えられる。\n\n大阪曹達は電解槽の水銀循環装置、解汞板、黒鉛電極の配置に独自の改良を重ね、大曹式水銀法を築いた。1931年からの約10年間には、この製法の実施権を同業数社へ供与した。小倉と尼崎の両工場は第二次世界大戦の戦災を受けずに残ったものの、尼崎工場は1945年9月の風水害で浸水した。尼崎工場の高潮の被害は通算4回に及び、水害の懸念が消えたのは大防潮堤が完成した1953年8月だった。資本金は1949年2月に700万円、同年10月に3,000万円、1950年8月に7,500万円へと段階的に増えた。戦災を免れた設備と同業へ供与できる製法の蓄積が、水害の復旧を抱えながらも次の上場と工場新設を支える土台になったのだろう。", "references": [ { "title": "証券 1953年（新規上場会社紹介）", "year": null, "month": null, "date": null, "url": null, "quotes": [] }, { "title": "会社銀行八十年史 1955年「大阪曹達」", "year": null, "month": null, "date": null, "url": null, "quotes": [] }, { "title": "企業の歴史（明治百年）1968年「大阪曹達」", "year": null, "month": null, "date": null, "url": null, "quotes": [] }, { "title": "人生問答 立花大亀対談集 第3集「田村太郎（大阪曹達社長）」", "year": null, "month": null, "date": null, "url": null, "quotes": [] } ], "start_year": 1920, "opinionPos": [ [ 265 ], [ 303 ] ] } ] } ], "long_term": [ { "year": 1950, "month": 3, "company_name": "大阪ソーダ", "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": "大阪ソーダ", "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": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 12, "operating_profit_jp": "営業利益", "operating_profit": 2, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 2, "net_margin": 16.666, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1953, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 14, "operating_profit_jp": "営業利益", "operating_profit": 2, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 2, "net_margin": 14.285, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1954, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 17, "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": 2, "net_margin": 11.764, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1955, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 15, "operating_profit_jp": "営業利益", "operating_profit": 2, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 1, "net_margin": 6.666, "employees": null, "reference": "上場会社総覧（1956年版）半期合算" }, { "year": 1956, "month": 3, "company_name": "大阪ソーダ", "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": "大阪ソーダ", "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": "大阪ソーダ", "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": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 25, "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": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 31, "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": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 33, "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": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 36, "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": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 38, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 0, "net_margin": 0, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1964, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 48, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 1, "net_margin": 2.083, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1965, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 55, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 1, "net_margin": 1.818, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1966, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 56, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 1, "net_margin": 1.785, "employees": null, "reference": "会社年鑑（1967年版）半期合算" }, { "year": 1967, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 64, "operating_profit_jp": null, "operating_profit": null, "ordinary_profit_jp": null, "ordinary_profit": null, "net_profit_jp": "当期純利益", "net_profit": 1, "net_margin": 1.562, "employees": null, "reference": "会社年鑑（1971年版）半期合算" }, { "year": 1968, "month": 5, "company_name": "大阪曹達", "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": 2, "net_margin": 2.702, "employees": null, "reference": "会社年鑑（1971年版）半期合算" }, { "year": 1969, "month": 5, "company_name": "大阪曹達", "consolidation": "単体", "accounting_standard": "JGAAP", "unit": "億円", "sales_jp": "売上高", "sales": 81, "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, 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