The station is served by the Nagasaki Main Line and is located 100.4 km from the starting point of the line at. It is also the eastern terminus of the Ōmura Line, 36.2 km from the starting point at and the western terminus and starting point for the private Shimabara Railway Line. Besides the local services on the line, the JR Kyushu rapid Seaside Liner service between and and the limited expressKamome stop at the station.
Station layout
The station consists of a side platform and two island platforms serving five tracks. Track/platform 0 is a dead-end siding which juts into the platform 1 and is used exclusively by the trains of the Shimabara Railway Line. Platform 2 is a second side platform serving track 2 while tracks 3 and 4 are served by the island platform. Since 18 June 2016, Isahaya has operated out of a temporary station building while the construction of a new station building is in progress. The temporary building houses a JR Kyushu ticket counter with a facility as well as a Shimabara Railway ticket window. From the station building there is direct access to platform 0 while access to the other platforms is by means of an underpass which is served by steps and elevators.
Platforms
This station has three platforms serving five tracks.
Adjacent stations
History
The private Kyushu Railway, had opened a track from to by 5 May 1895, and thereafter expanding southwards in phases, as part of the construction of a line to Nagasaki. Separately, a track was laid from north to Nagayo, which opened on 22 July 1897 as the terminus. On 27 November 1898 a link up was achieved with the track from Tosu which had expanded south to Ōmura and Nagayo, allowing through traffic from Tosu to Nagasaki. Isahaya was opened on the same day as an intermediate station on the track between Ōmura and Nagayo. When the Kyushu Railway was nationalized on 1 July 1907, Japanese Government Railways took over control of the station. On 12 October 1909, track from Tosu through Haiki, Ōmura, Isahaya, Nagayo to Nagasaki was designated the Nagasaki Main Line. On 21 August 1911, the Shimabara Railway Line from Isahaya to Hon-Isahaya was opened. On 24 March 1934, a track was opened from Isahaya to, known as the Ariake Nishi, as part of the development of an alternative route for the Nagasaki Main Line along the coast of the Ariake Sea. By 1 December 1934, a link up was achieved between the Ariake Nishi Line at Yue and the Ariake Higashi Line which had been extended south from to. The Ariake Nishi and Ariake Higashi Lines were then designated as part of the Nagasaki Main Line. The line from Haiki to Isahaya was separated to become the Ōmura Line. With the privatization of Japanese National Railways, the successor of JGR, on 1 April 1987, control of the station passed to JR Kyushu. In June 2016, work began on the construction of a new station building at Isahaya. The old station building, a timber structure in western style built in 1935, was noted for its role as a receiving station for relief trains carrying the injured from the atomic bomb at Nagasaki. This would be replaced by a new building scheduled to be completed in 2020, in time for the commencement of Shinkansen services to the station.
Passenger statistics
In fiscal 2016, the JR station was used by an average of 5,228 passengers daily, and it ranked 35th among the busiest stations of JR Kyushu. For the Shimabara Railway station, in fiscal 2014, there were a total of 356,467 boarding passengers, given a daily average of 977 passengers.
Surrounding area
Bus terminal for Nagasaki Kenei Bus and Shimabara Railway Bus
