It is located adjacent to the National Diet Building.

The station name literally means "in front of the National Diet Building".

The Chiyoda Line platforms are 37.9 m underground, making this station the deepest in the Tokyo Metro network (although a number of stations on the Ōedo Line are farther underground).

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

[1] In fiscal 2019, this station and Tameike-sannō combined[2] had an average of 150,922 passengers daily.