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 . 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.