is a bus-operating company in western Tama Area, mainly in Hachioji and Akiruno, Tokyo, Japan. It has in a subsidiary which once took charge of bus routes in western Hachioji area and Ome area, and expressway bus routes. Although it now belongs to Keio Group, it was originally a bus section of Ome Electric Railway Co. (present JR Ã Âme Line).
Nishi Tokyo Bus is a company established by a merger of Takao Jidà Âsha Co.(), Okutama Shinkà  Co.() and Goà  Jidà Âsha Co.() in 1963.
Takao Jidà Âsha's first route is between Hachià Âji Station - Mount Takao foot which started operation in 1916. This is in only three years, after the Keio Denki Kidà  (present Keio Corporation) operates around a bus for the first time (temporarily to railroad opening of traffic) in Tokyo in 1913, and in continuous operation, this became the first in the Tokyo-fu. Since This route competed with the route of Hachià Âji Shigai Jidà Âsha (present Keio Dentetsu Bus Hachioji office) which started operation in 1923, Takao Jidà Âsha established the new route between Hachià Âji Station - Kawarajuku, Ongata Village (present Hachioji City) in 1932, extended to Shimo-Ange () by 1924, and it became the prime route of Takao Jidà Âsha. It entered under the influence of Keio Teito Electric Railway (present Keio Corporation) in 1955.
Okutama Shinkà  is the company which Ome Electric Railway Co. established in 1928 by setting development of an area along the railroad line as the main purpose. The first bus line in Ome and Okutama area is between Futamatao Station (destination station of Ome Electric Railway of those days) and Hatonosu Station which was started operation by Okutama Jidà Âsha Co. in 1922. Ome Electric Railway purchased the Okutama Jidà Âsha in 1930, and it extended to Hikawa (Oku-Tama Station) in August of the same year. Although the railroad section of Ome Electric Railway was nationalized (present JR Ome Line) and the bus section operated by Ome Electric Railway succeedingly in April, 1944, all the bus enterprises of the Ome Electric Railway were transferred to the Okutama Shinkà Â, its subsidiary in April, 1946. Okutama Shinkà  entered under the influence of Keio Teito Electric Railway in 1956.
In 1920, Ishikawa Jidà Âsha was replaced with the stagecoach which operated between Imaguma, Kawaguchi-mura (present Hachioji) - Hachioji (Hiraokachà Â) until then, and started operation of the bus of track reconstruction between Itsukaichi - Hachioji. It extended to Hachioji station in 1924, and the company name was changed into Goà  Jidà Âsha Shà Âkai (it incorporated in 1947 and was re-change to Goà  Jidà Âsha). It entered under the influence of Keio Teito Electric Railway in 1961.
The three companies which used as the influence of Keio Teito Electric Railway, moved to the joint head office of the Keio Line Higashi-Hachioji station (present Keio Hachioji station) next door in April, 1963 for merger preparation aiming at rationalization of bus operation, Okutama Shinkà  merged other two companies on October 1, and Nishi Tokyo Bus launched. The symbol of a company is what designed the initial of Nishi Tokyo "NT" in the circle, and T imagined speediness and the feather of a bird, and it is published in the front of all the vehicles of a general route vehicle until it continues up to now. Since the number of routes increased rapidly by "bed-town"-izing of Hachioji and advance of educational facilities such as universities, and it became impossible to be unable to respond by at the existing office after the 1970s, Narahara Office was established newly in 1971 and Ongata Office is established newly in 1992.
Tama bus was split up by whole ownership and change of jurisdiction and commission of operation of an unprofitable route were started on April 1, 1999. Thereby, Ome Office was transferred to the Tama bus from 1999 to 2000, and Ongata Office from 2000 to 2005. On August 5, 2008, the official website of Nishi Tokyo Bus announced that it unified the bus division of Tama Bus and succeeded all the routes which Tama bus operated from the first bus on September 1 of the same year, in order to attain improvement in convenience and the increase in efficiency of business operation. Although Tama bus which business was transferred remains as a company, and will concentrate on enterprises, such as lease, management, etc. of land and a building, from now on.
On September 30, 2007, a smart card "PASMO" was introduced into the some area around Hachioji, and was introduced also into all the remaining areas on January 25, 2009.
Ome and Ongata depots were depots of Tama Bus till August 31, 2008.
All expressway bus routes were operated by Tama Bus till August 31, 2008.
Nishi Tokyo Bus owns the buses below: