Tokyo Metropolitan Subway Construction Company

{{Nihongo|Tokyo Metropolitan Subway Construction Co., Ltd.|東京都地下鉄建設株式会社|Tōkyō-to Chikatetsu Kensetsu Kabushiki-gaisha}} or Tokyo Subway is a third-sector organization with funding from the government of Tokyo and others. In Japanese, its name is often shortened to {{Nihongo|Chikaken|地下建}}. It was established on July 28, 1988, for projects related to the construction of the Toei Oedo Line. It was capitalized at 3 billion yen, including 2 billion from the government of Tokyo.

In 2004, it reported debts exceeding 527 billion yen.{{ref|debt}}