Obarajō was built by Satomi Yoshitoshi in 1337. The Satomi Clan were enfeoffed with the surrounding area in 1429. In 1501 the current layout of the castle was built-up to enclose the lord's manor. The castle was abandoned in 1591 following the fall of the Hōjō at Odawarajō.
Obarajō is a single bailey fortification which was surrounded by tall dorui (earthen embankments), of which the northern corner remains prominent. There are traces of dorui in the countryside surrounding the castle and so at some point the castle may have had up to two outer baileys. Formerly mizubori (water moats) also surrounded the castle but they were filled in in 1991, despite the castle being a historically designated site from 1982. The reason for this was apparently "environmental maintenance", according to a sign. Possibly it was due water levels in nearby rice paddies. The bailey is now the site of a shrine to the fox-god Inari, called aptly O'Shiro-Inari-jinja.
|Local Historic Site
|Pre Edo Period
|Dorui, Kuruwa, Mizubori-ato
|Tomobe Station on the Mito Line; 30 minute walk
|Kasama, Ibaraki Prefecture
|36° 21' 42.95" N, 140° 19' 22.51" E
|Added to Jcastle
|Admin Year Visited