Koganei (小金井市, Koganei-shi^?) is a city located in Tokyo, Japan. As of July 1, 2011, the city has an officially registered population of 116,055 with 56,296 households and a population density of 10,243.16 persons per km². The total area is 11.33 km².

The city was founded on October 1, 1958^{[citation needed]}.

Geographically, the city lies approximately at the center of Tokyo, and is located about 20 kilometers west of Shinjuku, where Tokyo Metropolitan Government has its headquarters. It is flanked on the north and the south by two large parks. To the north is Koganei Park, which includes the Edo-Tokyo Open Air Architectural Museum, a branch of the Edo-Tokyo Museum located in Ryōgoku, Tokyo. To the south is Nogawa Park and Tama Cemetery, two of the largest green areas in Tokyo.

Koganei City is transected by the JR Chūō Line, and is served by the Higashi-Koganei and Musashi-Koganei stations. It takes approximately 30 minutes to reach Musashi Koganei Station from Tokyo Station by Chūō Line. The distance between Higashi Koganei Station and Musashi Koganei Station is just 2 km, which takes about 2 minutes to go by JR Chūō Line^{[citation needed]}. Additionally, Shin-Koganei Station on the Seibu Tamagawa Line serves the eastern portion of the city.

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 administers the 23 special wards of Tokyo (each governed as a city), which cover the area that was the city of Tokyo, as well as 39 municipalities in the western part of the prefecture and the two outlying island chains. The population of the special wards is over 8 million people, with the total population of the prefecture exceeding 13 million. The prefecture is part of the world's most populous metropolitan area with upwards of 35 million people and the world's largest urban agglomeration economy with a GDP of US$1.479 trillion at purchasing power parity in 2008, ahead of New York City metropolitan area, which ranks second on the list. The city hosts 47 of the Fortune Global 500 companies, the highest amount of any city.