Hikone Castle Museum, located in the historic city of Hikone, Shiga Prefecture, is a prominent cultural institution founded in February 1987 to commemorate the 50th anniversary of Hikone's city status. The museum is situated on the site of the former Otemon, the main gate to Hikone Castle, and showcases the rich history and culture of this traditional castle town. It houses a remarkable collection of approximately 45,000 items, including exquisite arts and crafts as well as ancient documents from the Ii family, the hereditary lords of the Hikone Domain.

The total collection exceeds 91,000 artifacts, providing an extensive overview of Hikone's heritage. Visitors can explore various exhibitions, educational programs, and special events that celebrate the significance of the Hikone domain, making it an engaging destination for history enthusiasts and families alike. Open year-round with designated closure dates, the museum offers insight into the legacy of the Ii family and the broader history of the region