is an underground metro station located in Naka-ku, Nagoya, Aichi Prefecture, Japan operated by the Nagoya Municipal Subway. The station is an interchange station between the Tsurumai Line and the Sakura-dà Âri Line, and is located 6.3 rail kilometers from the terminus of the Tsurumai Line at Kami-Otai Station and 2.4 rail kilometers from the terminus of the Sakuradà Âri Line at Taiko-dori Station.
This station provides access to , the headquarters of Chunichi Shimbun, and the Brazilian consulate in Nagoya. It is the deepest station in the city's subway system, with the Sakura-dà Âri Line platform located 23.9 meters below ground.
Marunouchi Station was opened on 27 November 1981 as a station on the Tsurumai Line. The Sakura-dà Âri Line connected to the station on 10 September 1989. Platform screen doors were installed on the Sakura-dà Âri Line platform on 5 March 2011.
Marunouchi Station has two underground island platforms. The Sakura-dà Âri Line platform, at a depth of 24 meters, is the deepest subway platform in Nagoya.
On Platform 1, door 1 is closest to the connecting passage to the Sakuradà Âri Line platform and door 16 is closest to the elevator, and on Platform 2, door 9 is closest to the elevator and door 24 is closest to the connecting passage. On the platforms for the Sakuradà Âri Line, on Platform 3 for Akaike door 8 is closest to the elevator and the connecting passage is behind the train, beyond door 20, and on Platform 4 for Nagoya, door 17 is closest to the elevator and door 1 is closest to the connecting passage. There are two wickets, the East Wicket for the Sakuradà Âri Line portion of the station and the North Wicket for the Tsurumai Line portion.