Oniwa

Weekday departures: 50/day · Sat & holiday departures: 50/day

First / last departure (weekday): 6:06 / 23:13

Busiest hour: 8:00–9:00 (5)

0:00 ─ 23:00

Figures are typical departures in the timetable data, not a live service count.

Timetable data as of 5 May 2026.

• Matsumoto Dentetsu Kamikochi Line: Shinano-Arai ⇄ Shimonii

Ōniwa Station opened on 2 October 1921 as a stop on the Tsukama Railway, the predecessor of today's Kamikōchi Line, located in what is now Matsumoto, Nagano Prefecture. The operating company was renamed to Tsukama Electric Railway in 1922 and to Matsumoto Electric Railway in 1932 before the line passed to Alpico Kōtsū on 1 April 2011. The single ground-level side platform sits 2.6 kilometres from the line's terminus at Matsumoto. Station staff were withdrawn in February 2010, and the original building was later dismantled by 2021 and replaced with barrier-free ramps and a cycle park.

After the heavy rain of August 2021 damaged the Tagawa bridge and services were suspended, the substitute bus stop for this station was beside a now-closed simple post office to the north.