After establishing the Keihan Bus Kyotanabe Management Office (name of the office at the time) in 1989, some buses under control of the Otokoyama Management Office were transferred to Tanabe Management Office, and began their operations; the number of buses controlled by Tanabe Management Office gradually increased.
その後1989年に京阪バス京田辺営業所（当時）の開設により一部の便が田辺の管轄となり、順次田辺管轄便を増強した。