Akashi Castle is a historic Japanese castle located in Akashi City, Hyogo Prefecture. It once served as the administrative headquarters and residence of the lords of the Akashi Domain. The castle is also known as Kiharu Castle or Kinkō Castle. Today, its grounds form part of Hyogo Prefectural Akashi Park, where visitors can explore the castle ruins, impressive stone walls, and two surviving turrets that recall its former grandeur.
Akashi Castle stands just north of JR Akashi Station, and its distinctive turrets can be seen from the station platforms. Built on the tip of a low hill, it was designed as a hilltop castle combining connected enclosures with terraced defensive sections.
The area has long been an important transportation hub. The Sanyō Road passed through the region, while routes to the north connected with the provinces of Tamba and Tajima. Routes also linked the area with Awaji Island and Shikoku. Recognizing its strategic importance, the Tokugawa shogunate selected Akashi as a key stronghold for maintaining control over the powerful feudal lords of western Japan, following the construction of Himeji Castle.
The area within the former middle moat is now Hyogo Prefectural Akashi Park, a popular public park designated as one of Japan’s 100 Best Cherry Blossom Viewing Sites. The castle’s stone walls and turrets suffered damage during the Great Hanshin-Awaji Earthquake in 1995, but extensive restoration work subsequently repaired the damage.
In 1617, Ogasawara Tadazane became lord of the newly established Akashi Domain after transferring from the Matsumoto Domain in Shinano Province, present-day Nagano Prefecture. He initially took up residence at Funagami Castle, west of the present site. The Tokugawa shogunate then ordered him to build a new castle as the seat of the Ogasawara family, a hereditary Tokugawa retainer family holding a domain valued at 100,000 koku.
In consultation with Honda Tadamasa, lord of Himeji Castle, three possible sites were considered: Shioya-cho, Kanigasaka, and Hitomaru-yama. Hitomaru-yama was ultimately selected because of its favorable terrain.
Construction began in 1619, and the castle was completed sufficiently for Ogasawara Tadazane to move from Funagami Castle in 1620. Materials were obtained from several nearby castles, including Miki, Takasago, Edakichi, and Funagami. The Tatsumi Turret is said to have been relocated from Funagami Castle, while the Hitsujisaru Turret came from Fushimi Castle in Kyoto.
A main keep was planned but was never built. Instead, the castle’s defensive strength relied on its layout, stone walls, moats, and corner turrets. This arrangement gave Akashi Castle a distinctive profile, with the two surviving turrets now serving as its most recognizable features.
In 1632, Ogasawara Tadazane was transferred to Kokura in Buzen Province, present-day Fukuoka Prefecture. A succession of lords followed, including members of the Matsudaira, Okubo, and other daimyo families, as political transfers frequently changed the castle’s ownership.
Eventually, Matsudaira Naoaki of the Echizen branch became lord. The Matsudaira family governed Akashi for ten generations over approximately 189 years. As the castle deteriorated with age, major renovation work was carried out in 1739.
Following the abolition of the feudal domains in the Meiji period, Akashi Castle was abandoned, and many of its buildings were dismantled. In 1881, the Ushitoru Turret was taken apart, and its materials were reportedly reused in the construction of Kobe Aioi Elementary School. The grounds were developed as a public park in 1883.
In 1898, the site became imperial property. Repairs were carried out on the Tatsumi and Hitsujisaru turrets in 1901, although the Inui Turret on the northwestern side was dismantled. Hyogo Prefecture subsequently leased the grounds and opened Hyogo Prefectural Akashi Park in 1918.
The Great Hanshin-Awaji Earthquake in 1995 caused substantial damage, including collapsed sections of the stone walls. Restoration work continued for five years and was completed in 1999. The project included moving the turrets using a technique known as hikiy a, in which a building is shifted from its original position, as well as repairing their foundations.
In 2003, Musashi’s Garden was created in the Sannomaru area and opened to the public. The garden provides a peaceful place to enjoy seasonal scenery within the historic castle grounds.
The original layout centered on the Honmaru, or main enclosure. The Ninomaru lay to the east, followed farther east by the Higashi-no-maru, while the Sannomaru extended to the south and the Inari Enclosure occupied the western side. The Tokugawa shogunate oversaw construction of the Honmaru, Ninomaru, and Higashi-no-maru, while the Sannomaru and the development of the surrounding town were joint projects involving the shogunate and the Ogasawara family.
Four three-story turrets originally stood at the corners of the Honmaru, but no main keep was ever constructed. The Tatsumi Turret on the southern side and the Hitsujisaru Turret on the southwestern side survive today. Both were designated Important Cultural Properties of Japan in 1957.
The castle’s defenses combined constructed barriers with the surrounding landscape. The Akashi River protected the western side, while a moat that also served as a harbor lay to the south. To the north, Kōnoike Pond and natural woodland helped reinforce the defensive perimeter.
The castle’s stone walls and surviving turrets offer a glimpse of the original defensive system. In 2004, the wider Akashi Castle site was designated a National Historic Site, recognizing the historical importance of the castle and its remaining structures.
The lord’s residence once stood inside the Honmaru and featured elaborate interiors. Its sliding-door paintings, known as Flowers, Birds, Landscapes, were created by Hasegawa Tōjin. The residence was destroyed by fire in 1631, but some of the paintings were reportedly removed and transported to the domain’s warehouse in Osaka.
After alterations during the Meiji period, these surviving paintings eventually came under the care of the Ehime Prefectural Museum of Art, where they are held in trust.
Today, the former castle grounds are enjoyed as Hyogo Prefectural Akashi Park, a green urban retreat close to the station. Visitors can stroll along the moats, admire the stone walls and historic turrets, and enjoy the changing scenery throughout the year. The park is particularly popular in spring, when cherry blossoms transform the grounds.
Musashi’s Garden in the Sannomaru area offers another peaceful place to explore. The park also hosts the annual Akashi Castle Illumination Project, during which illuminated displays create the impression of a glowing castle rising into the night sky.
Akashi Castle is an excellent destination for travelers interested in Japanese castle architecture and the history of the Edo period. Its two surviving turrets, extensive stone walls, and carefully preserved parkland offer a rewarding visit, while its location immediately north of JR Akashi Station makes it easy to include in a wider sightseeing trip around Akashi and the Harima region.