Ryo-oka Castle
Ryuko Jo
Located in Saku City, Nagano Prefecture, Ryo-oka Castle is a precious historical site featuring one of only two star-shaped fortresses in Japan.Explore this spot
Ryo-oka Castle is a historic Japanese castle site located in Taguchi, Saku City, Nagano Prefecture. It served as the administrative center for the Ryo-oka Domain (Tanoguchi Domain) during the late Edo period.
What makes it special
About Ryo-oka Castle
- Witness the rare star-shaped fortification structure up close.
- The interior tour of the Odaidokoro (requires reservation) is a highly exclusive experience.
- Enjoy a historical walk to find architectural pieces preserved in local temples and shrines.
- Learn deep historical details at the "Saku City History Village Aino-kan."
Photo gallery
All photos
Weather forecast
Wed
8/5
26°/16°
0%
Thu
8/6
27°/21°
70%
Fri
8/7
28°/22°
97%
Sat
8/8
30°/19°
99%
Sun
8/9
27°/18°
92%
Mon
8/10
25°/19°
65%
Tue
8/11
26°/19°
38%
Tips
Payment
Cash recommended for nearby facilities or specific experiences.
Language
English support is limited; most signs are in Japanese.
Reservation
Advance booking is required for the Odaidokoro interior tour.
Clothing
Wear comfortable walking shoes for uneven paths.
Photography
Drone use requires permission from Saku City Hall.
Accessibility
The site has many steps and unpaved areas; not suitable for wheelchairs.
Etiquette
Please respect the historical site and avoid touching the ruins excessively.