Ida Castle (Mikawa)


MikawaIdajou (1).JPG


Idajō was a hirajiro (flatland castle) constructed on a hill by the Sakai Clan as a satellite fortification of Okazaki Castle. The Sakai Clan was founded by Sakai Hirochika, considered to be the son of Matsudaira Chikauji, founder of the Matsudaira Clan. Lords of Idajō included Sakai Ujitada, Sakai Tadakatsu, Sakai Yasutada, Sakai Tadachika, and Sakai Tadatsugu. Tadatsugu, who was born at Idajō, was one of Tokugawa Ieyasu’s most prominent generals.

Latter day depictions of Idajō (castle bloggers have been around from at least the Edo period) show the ruins of a castle with a central square compound surrounded by moats and earthen ramparts. In the Sengoku period the castle had also a secondary baileys and a settlement attached to the south. The residences of the Sakai Clan were located around the castle.

Visit Notes

Located in the Ida neighbourhood of Okazaki City, Idajō is now a park and an Inari shrine. The park and koaza (‘block’) are both called ‘Shiroyama’. No definitive ruins remain but the shape of the hill and its defensive potential are suggestive.

  • Stele for castle

Castle Profile
English Name Ida Castle (Mikawa)
Japanese Name 三河井田城
Founder Sakai Clan
Year Founded Sengoku Period
Castle Type Flatland
Castle Condition Ruins only
Historical Period Pre Edo Period
Visitor Information
Access Kita-Okazaki Station on the Aichi Loop Line; 12 minute walk to Shiroyama Park
Visitor Information 24/7 free; park
Time Required 20 minutes
Website (%E4%B8%89%E6%B2%B3%E5%9B%BD)
Location Okazaki, Aichi Prefecture
Coordinates 34° 58' 37.31" N, 137° 9' 52.24" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Jōkaku Hōrōki
Jōkaku Shashin Kiroku
Nippon Shiro Meguri

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