Fujihashi Castle, Tenshu and museum in Ibigawa, Japan.

Fujihashi Castle is a four-storey building in Tsurumi, Ibigawa, with a keep-like exterior modelled on Hikone Castle. The first floor holds a planetarium, the second a star exhibition room, the third displays the history and folklore of the former Fujihashi village including armour, and the fourth is an observation room.

Fujihashi Castle was built in 1989 by the former Fujihashi Village as a planetarium, its keep modelled on Hikone Castle's tenshu. The site is presented purely as a tourist attraction, not a castle ruin. A fort called Sugihara-toride is said to have stood nearby in the Nanboku-chō period, but no trace remains at this spot and its existence is unconfirmed.

The castle displays traditional Japanese architectural elements like tiled roofs, patterned gables, and rooms divided by sliding doors. These features reflect how Japanese design principles shape the building's appearance and layout.

The location combines the tenshu, museum, and planetarium under one roof, allowing visitors to explore multiple themes in a single stop. Plan enough time to experience all sections at a comfortable pace.

The castle's keep imitates Hikone Castle's tenshu, though the building is a 1989 village planetarium. It was featured on TV Asahi's "Nanikore Chinbiken" on 30 May 2021. Nearby stood Sugihara Fort, said to have been built by Nitta Yoshifada against the Toki clan, but no trace of it remains at the site.