- 1928-10-25: The completed Hakubi Line is opened, with Bitchū-Kōjiro Station opening at the same time.
- 1930-02-10: Connected to the Sanshin Line (now the Geibi Line), with service to Yagami Station. Bitchū-Kōjiro Station used to be the busiest station in Niimi, with numerous trains arriving and departing daily. While the station is still busy, many of the trains now go through Niimi Station.
- 1987-04-01: With the privatization of the Japanese National Railways, Bitchū-Kōjiro Station becomes a JR West station.
Bitchū-Kōjiro Station has three platforms: one next to the station building and two on a platform island, accessible via an overpass over the tracks. The entrance to the station features an old-style gate which is considered a local area treasure. This station is considered the start of the Geibi Line, and official distance for the line starts at zero here.
- Platform1: Hakubi Line (service to Niimi)
- Platform1: Hakubi Line (service to Yonago Station)
- Platform 3: Geibi Line (service to Bingo Ochiai and Niimi)
- The Niimi City Shingō Branch Office
- Route 182
- Shingō parking area of the Chūgoku Expressway
- Okayama/Tottori Prefectural Route 8, Niimi Nichinan Route
All lines are JR West lines.
- Hakubi Line (passing through Nunohara Station)
- Niimi Station — Bitchū-Kōjiro Station — Ashidachi Station
- Geibi Line
- Nunohara Station — Bitchū-Kōjiro Station — Sakane Station
- (Japanese) JR West