code: 360) is located at Kumakōgen in Ehime Prefecture, Japan.

The observatory is in the Furusato Country Open Air Museum that incorporates the Seiten Castle (sei ten means "fine weather" and can also mean "star sky".)

The observatory has a 60 cm aperture optical telescope.

Members of the public can book to observe at night, weather permitting.

The observatory's best known staff member is the prolific discoverer of asteroids, Akimasa Nakamura.