Kasai Station is served by the Tokyo Metro Tozai Line, and is numbered T-17.

The station facilities were inherited by Tokyo Metro after the privatization of the Teito Rapid Transit Authority (TRTA) in 2004.

[1] The station has the world's largest fully automated parking lot for bicycles where about 9,400 bicycles are automatically parked in its 15 metre deep basement.

Each of the automatic elevators at the parking lot can handle up to 180-190 and it takes just 23 seconds to retrieve the bicycle.

[citation needed] The Tokyo Metro Museum is also located beneath the platforms of Kasai station and was opened in 1986.