Hamamatsucho Building, Office skyscraper in Minato ward, Tokyo, Japan

The Hamamatsucho Building is a 40-storey office tower in Shibaura, Minato, Tokyo, with a flat roof and a facade of rectangular glass windows in grey frames. A deep vertical channel runs down its left side, and a red TOSHIBA sign stands on a lower structure in front.

Construction began in August 1981 and the tower was completed in 1984, the 45th anniversary of Toshiba's founding, at a cost of about 40 billion yen. Named Toshiba Building, it housed the headquarters of Toshiba and group companies. It was renamed Hamamatsucho Building in 2013 after Toshiba moved most head-office functions to Kawasaki. It closed at the end of September 2025 and demolition began the next day.

The building's name changed from Toshiba Building to Hamamatsucho Building in 2013, after Toshiba moved most head-office functions to Lazona Kawasaki. Its lower floors housed a Maruzen Oil (later Cosmo Oil) office and a Toshiba Building post office. In the inner courtyard, a summer karaoke contest drew participants from nearby shopping streets.

The building sits near Hamamatsucho Station, which offers direct access to the Tokyo Monorail heading to Haneda Airport. The location provides convenient connections to major railway lines throughout the city.

The building's deep "gate-shaped" profile, with upper floors set back from the base, was a structural choice: the 80% rentable ratio gained one extra floor within the 40-storey frame. Its bright silver-white aluminium curtain wall was coloured to contrast with the neighbouring World Trade Center Building.