History
Ajiro Station opened on 30 March 1935 as the southern terminus of the Railway Ministry's newly built Itō Line extending from Atami. The line was extended onwards to Itō Station on 15 December 1938, ending the station's role as a terminus. Following ministerial reorganisations the station passed to the Ministry of Communications and Transportation in 1943 and to Japanese National Railways in 1949. Freight handling ended on 10 January 1963. With the breakup and privatisation of JNR on 1 April 1987 the station became part of JR East. ICOCA-equivalent Suica was introduced in October 2004 and the station was incorporated into the Tokyo Suburban Area. The Midori-no-Madoguchi staffed window closed on 7 March 2015, and the next day the station was made unstaffed with the introduction of a remote-support system. From the March 2024 timetable revision, the Odoriko limited express no longer stops here.
History summarized from Japanese & English Wikipedia · last reviewed 2026-06-09.
Where the English and Japanese sources differ, this account follows the Japanese source.
Notes
Although it bears the name Ajiro, the station does not actually lie in Atami's Ajiro district; it sits in neighbouring Shimotaga, and the curve of the platform on a 240 to 400 m radius means trains must crawl through at 35 km/h.