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Tokyo (東京, Tōkyō^?, "Eastern Capital") [toːkʲoː], English: /ˈtoʊki.oʊ/; officially Tokyo Metropolis (東京都, Tōkyō-to^?), is one of the 47 prefectures of Japan. Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the largest metropolitan area of the world. It is the seat of the Japanese government and the Imperial Palace, and the home of the Japanese Imperial Family. Tokyo is in the Kantō region on the southeastern side of the main island Honshu and includes the Izu Islands and Ogasawara Islands. Tokyo Metropolis was formed in 1943 from the merger of the former Tokyo Prefecture (東京府, Tōkyō-fu^?) and the city of Tokyo (東京市, Tōkyō-shi^?).

The Tokyo Metropolitan Government Building (東京都庁舎, Tōkyō-to Chōsha^?), also referred to as Tokyo City Hall or Tochō (都庁) for short, houses the headquarters of the Tokyo Metropolitan Government, which governs not only the 23 wards, but also the cities, towns and villages that make up Tokyo as a whole.

Located in Shinjuku, it held the title of the tallest building (by roof height) in Tokyo, at 243 meters (799 feet), from 1991 to late 2006, when it surrendered its title upon the completion of Midtown Tower. The two panoramic observation decks, one in each tower on floor 45 (202 meters high), are free of charge to the public and contain gift shops and cafes. They are open till 23:00 on weekdays. Use of cameras is permitted, but tripods are forbidden.

The building consists of a complex of three structures, each taking up a city block. The tallest and most prominent of the three is Tokyo Metropolitan Main building No.1, a tower 48 stories tall that splits into two sections at the 33rd floor. The building also has three levels below ground. The design of the building (which was meant to resemble a computer chip), by architect Kenzo Tange (and associates), has many symbolic touches, most notably the aforementioned split which re-creates the look of a Gothic cathedral.