Ubaguchi Fort

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UbaguchiToride (1).JPG


Ubaguchi-toride was a small fort built by Tokugawa forces in 1582 to facilitate their entry into Kai from Suruga. This is recorded in the diary of Matsudaira Ietada, an aid to Tokugawa Ieyasu. Given the importance of the Ubaguchi Pass, it is possible albeit unknown that the Takeda also maintained a fort here.

Visit Notes

Ubaguchi-toride is a yamajiro (mountaintop castle) site at the edge of the Kai Basin. The old prefectural road from before the construction of Ubaguchi Tunnel weaves around the base of the fort-mount, but it is not accessible between December and April. I had to walk a little up the track from the point at which a barrier gate stands. I scrambled up the hillside from the rear of the fort so as to be sure not to miss any trench ruins. Ubaguchi-toride is a single bailey fort complex with some terracing and tatebori (climbing trenches). Beneath the fort is the village of Ubaguchi-juku, a shukuba (post town) which served as the main stop before leaving Kai for Suruga for centuries until the construction of the modern tunnel.

  • Climbing Trench / Tatebori
  • terracing
  • Ubaguchi-juku
  • main bailey

Castle Profile
English Name Ubaguchi Fort
Japanese Name 右左口砦
Alternate Names Ubakuchi-toride
Founder Matsudaira Ietada
Year Founded 1582
Castle Type Mountaintop
Castle Condition Ruins only
Historical Period Pre Edo Period
Features trenches
Visitor Information
Access Nearest Station is Kai-Ueno on the Minobu Line; take the old road to Lake Shōji (closed in winter)
Visitor Information 24/7 free; mountain
Time Required 30 minutes
Location Kōfu, Yamanashi Prefecture
Coordinates 35° 33' 59.15" N, 138° 35' 42.65" E
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Added to Jcastle 2023
Contributor ART
Admin Year Visited Viewer Contributed
Friends of JCastle
Kojō no Fūkei

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