Hadanashiyama Castle

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Hadanashiyamajou (1).JPG


Hadanashiyamajō was built as a fortified mountaintop dedoubt paired with Hadanashijō to the north. See Hadanashijō for more info'.

Visit Notes

Hadanashiyamajō is a yamajiro (mountaintop castle) ruin in Hadanashi Township, Okazaki Municipality. Ruins consist of baileys and trenches sculpted from the hilltop. There are two integral baileys separated by a trench system. There is evidence of a trench to the rear of the site which would've protected from the direction of the ridge. The main bailey is ensconced by spiral-like tiers of koshikuruwa (terraced baileys).

The castle-mount can be accessed from a path opposite the cemetery. The trail goes past abandoned rice paddies which have returned to nature. There is a strange, square pit formed from berms and some stone-piled retaining walls near the start of the trail. The pit is the size of a small room and has an entrance area with stone walls. I thought it might be a storage pit or a pen for an animal.

  • Horikiri (trench)

Castle Profile
English Name Hadanashiyama Castle
Japanese Name 秦梨山城
Founder Ao Clan
Year Founded Medieval Era
Castle Type Mountaintop
Castle Condition Ruins only
Historical Period Pre Edo Period
Artifacts Tatebori, Kuruwa, Koshikuruwa, &c.
Features trenches
Visitor Information
Access I cycled from Okazaki. 'Hello Cycle' rental bicycles are available in Okazaki.
Visitor Information 24/7 free; mountain
Time Required 30 minutes
Location Okazaki, Aichi Prefecture
Coordinates 34° 56' 48.26" N, 137° 14' 58.92" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Jōkaku Shashin Kiroku
Umoreta Kojō
Aichi Shiro
Kojō Seisuiki
Shiseki Tanbōki

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