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株式会社土井製作所
1942-03-01
Japan
電力・通信インフラ用架空線・地中線材料の設計・開発・製造
公共事業向けインフラ構築
電力・通信関連事業の設計サポート
新商品開発提案
防災減災・インフラメンテナンスサービス
脱炭素関連技術提供
鉄鋼製品の製造・販売（マンホール鉄蓋・防水鋳鉄管等）
防水型ハンドホールシステムの開発・販売
建設業（建設業許可）
〒105-0013 東京都港区浜松町2丁目3番8号 WTC annex 7階
西川 直志
100,000,000
Company name
Group Parent Subsidiary Customer Supplier Alliance Bank Shareholder
大豊産業株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Group Customer Supplier
土井工業株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Group Subsidiary
中国電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
中部電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
九州電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
古庄電機産業株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
四国電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
日本海商事株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
日本高速通信株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
東京通信ネットワーク株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
株式会社北海道ダイエィテック
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
株式会社田口商会
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
泉州電業株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
誠新産業株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
豊国商事株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
長沼商事株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
関西電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer Supplier
JR各社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
公団
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
北海道電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
北陸電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
国土交通省
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
地下鉄各社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
地方自治体
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
文部科学省
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
日本コムシス株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
日本国有鉄道
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
日本電信電話公社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
日本電信電話株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
東京電力パワーグリッド株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
東京電力ホールディングス株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
東京電灯株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
東北電力株式会社
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
株式会社協和エクシオ
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
株式会社関電工
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
総務省
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer
防衛省
Group company Parent Subsidiary Customer Supplier Alliance Bank, lending and credit Investment, equity and shareholders
Customer

33 entries
DateDescription
1927 土井製作所は、1927年の創業以来、電力インフラや交通インフラといった社会基盤の整備を支える製品を通じて、人々の暮らしの向上とネットワーク社会の発展に貢献してまいりました。
1927-05-01 創立年月日 : 昭和2年5月1日
1933-04 東京電灯株式会社(現東京電力ホールディングス株式会社)との取引開始
1938-02 埼玉県川口市に鋳物工場を新設
1938-04 電力型マンホール鉄蓋の製造販売開始
1942-03-13 株式会社土井製作所設立
1945-02 本社を東京都浅草区(現台東区)に移転
1957-04 東北電力株式会社との取引開始
1958-04 北海道電力株式会社との取引開始
1959-04 建設省型マンホール鉄蓋・防水鋳鉄管の製造販売開始
1960-04 建設業東京都知事登録
1960-05 日本国有鉄道(現JR各社)との取引開始
1961-02 北陸電力株式会社との取引開始
1965-04 日本電信電話公社(現日本電信電話株式会社)と取引開始
1965-08 本社を東京都江東区に移転
1973-04 千葉県印旛郡白井町に総合工場(白井工場)を新設
1976-10 建設業建設大臣許可
1978-04 九州電力株式会社との取引開始
1979-04 四国電力株式会社との取引開始
1979-10 土井工業株式会社設立
1980-04 中国電力株式会社との取引開始
1982-04 関西電力株式会社との取引開始
1982-04 中部電力株式会社との取引開始
1985-10 日本高速通信株式会社(現KDDI)との取引開始
1986-05 東京通信ネットワーク株式会社(現KDDI)との取引開始
1998-09 ISO9001(品質)の認証取得
2012-03 上海代表処開設
2013-12 バーチャル展示場開設
2017-07 防水型ハンドホールシステムDDH-Sタイプが「地方独立行政法人東京都立産業技術研究センター理事長賞」受賞
2017-10 名古屋オフィス開設
2018-03 大豊産業株式会社と資本業務提携によりグループ会社化
2027 弊社は2027年に創立100周年を迎えます
2027 おかげさまで、弊社は2027年に創立100周年を迎えます。
+ Loaded when opened
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2026-09-21 18:17 (Model: ggml-org/gpt-oss-20b )
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