日岡山公園, Municipal park in Kakogawa, Japan

Hiokayama Park is Kakogawa's largest general park, covering about 35.8 hectares at the northern edge of the city center. It holds a baseball ground, gymnasium, martial arts hall, tennis courts, and a public pool, plus a soccer field converted from an athletics track. The grounds contain the Hiokayama burial mound group, including five keyhole-shaped tombs such as the Imperial Household Agency-managed Hioka Mausoleum, and about 1,000 cherry trees.

The site has ancient roots, with an imperial tomb and multiple burial mounds that were preserved when the park was established. These archaeological features span different historical periods and remain visible throughout the grounds today.

The park is known for its roughly 1,000 cherry trees, which draw crowds every spring. Nearby stands Hiyoka Shrine, visited by people praying for safe childbirth. The grounds also hold the OAA Harima Heights lodging facility, used for recreational stays.

The park is easily accessible by train or car, with multiple parking areas available for visitors who drive. Walking paths connect the different facilities, making it simple to move around the grounds.

The soccer ground was converted from an athletics stadium, and it hosts matches of the Kansai Soccer League. Cento Cuore HARIMA, a team based in Harima, also uses the park's facilities for training.