Inaniwa Castle (Akita Prefecture) Complete Guide | A Thorough Explanation of the Charms of the Onodera Clan’s Residence and the Golden Room
Inaniwa Castle, towering over the hills of Yuzawa City, Akita Prefecture, is a historical tourist facility characterized by its reconstructed keep built on the site of a medieval mountain castle. It was the residence of the Onodera clan, a powerful daimyo family that ruled southern Akita Prefecture for approximately 400 years from the early Kamakura period, and now attracts many tourists as a regional symbol.
This article comprehensively explains everything you need to know before visiting Inaniwa Castle, from its historical background to its highlights, access methods, and business hours.
History of Inaniwa Castle | The 400-Year Residence of the Onodera Clan
Construction History and the Rise of the Onodera Clan
The history of Inaniwa Castle dates back to the early Kamakura period. It is believed that Inaniwa Castle was built by Onodera Rokuro Tsunemichi during the Kenchō era (1249-1256), but one theory suggests that it was built by Onodera Shigemichi in the first year of the Kenkyū era (1190).
The Onodera clan served in Minamoto no Yoritomo’s conquest of Ōshū, and for their achievements, they were appointed as the jitō (land steward) of Ogachi District in Ugo Province. Inaniwa Castle was built to serve as their base of operations, and for approximately 400 years thereafter, it became a base that controlled the southern part of Akita Prefecture.
Characteristics as a Medieval Mountain Castle
Inaniwa Castle was constructed as a typical medieval mountain castle. Also known as Hayasaka-kan, Tsuruga Castle, and Maizuru Castle, it possessed a defensive structure that skillfully utilized the natural terrain. Its features include the arrangement of baileys (kuruma) utilizing the mountain ridges and its function as a natural stronghold due to the rugged terrain.
The Decline of the Onodera Clan and the End of the Castle
At the end of the Sengoku period, the Onodera clan became embroiled in conflicts with surrounding forces such as the Mogami and Date clans. After the Battle of Sekigahara, the Onodera clan was dispossessed of their domain, and Inaniwa Castle was abandoned. For a long time afterward, the castle ruins were buried in history, but in 1988, a replica keep was constructed, leading to its current appearance.
The Current Inaniwa Castle | Replica Keep and Tourist Facilities
The Replica Keep Constructed in 1988
The current Inaniwa Castle is a reinforced concrete replica keep constructed in 1988 on the site of the former second bailey. It is a three-story, four-tiered, independent-style tower. While it does not replicate the historical castle architecture, it functions as a regional symbol and a museum facility that conveys the history of the Onodera clan.
The beautiful contrast of white walls and black tiles harmonizes with the surrounding lush greenery, making its presence felt even from afar.
Highlights of the Museum | Exhibits on Each Floor
First Floor (1F): Entrance and Basic Exhibits
The first floor houses the reception and entrance hall, and features basic exhibits on the overview of Inaniwa Castle and the history of the Onodera clan. Castle stamps are also sold here, making it a must-see spot for castle enthusiasts.
The castle stamps, featuring the Onodera clan’s family crest, the “Rokuyō Mokkō” (six-leaf quince), and an illustration of Inaniwa Castle, are popular as souvenirs of visits.
Second Floor (2F): Items Related to the Onodera Clan
The second floor displays historical materials, weapons, and ancient documents related to the Onodera clan. Through these valuable items, which tell the story of the Onodera clan’s rule over approximately 400 years, visitors can learn about the history of southern Akita Prefecture from the medieval period to the Sengoku period.
Third Floor (3F): Traditional Crafts Exhibition
The third floor displays traditional crafts from the Yuzawa City area, such as Kawatsura lacquerware. This is a rare opportunity to appreciate the techniques and beauty of this traditional craft, a source of local pride alongside Inaniwa udon noodles.
Kawatsura lacquerware is a traditional craft with a history of approximately 800 years, and its delicate techniques and elegant designs continue to captivate many people.
Fourth Floor (4F): Golden Room and Observation Deck
The greatest highlight of Inaniwa Castle is on the fourth floor. Here you’ll find a tea room called the “Golden Room,” a magnificent space with gold leaf covering the ceiling. This Golden Room is truly breathtaking and leaves a powerful impression on visitors.
The fourth floor also functions as an observation deck, offering a spectacular panoramic view of the Inaniwa region. On a clear day, you can see not only Yuzawa City but also neighboring towns and villages, making it perfect for a relaxing time.
The view from the observation deck changes with the seasons, offering different beauty depending on when you visit: the fresh greenery of spring, the deep green of summer, the vibrant autumn foliage, and the snowy winter landscape.
Tohoku’s Longest Slope Car
A notable feature of Inaniwa Castle’s access is the slope car connecting the parking lot to the replica keep at the site of the second bailey. Boasting a length of 237 meters, this slope car is the longest in Tohoku and is an attraction in itself.
While it’s possible to climb the castle on foot due to its mountainous location, using the slope car makes reaching the castle much easier. The slow-moving slope car offers views of the surrounding nature and the Inaniwa village, making the journey itself an enjoyable experience.
Business Information and Access
Basic Information
Location: 50 Furudatemaehira, Inaniwa-cho, Yuzawa City, Akita Prefecture
Operating Period: Mid-April to Early November (Closed during winter)
Opening Hours: 9:30 AM – 4:30 PM (Closing Time)
Closed Days: Tuesdays (Closed the following day if Tuesday is a public holiday)
Admission Fee:
- Adults: Approximately 350 yen (Additional fee applies for slope car)
- Elementary and Junior High School Students: Discounted rates available
*Please check official information before visiting, as prices may change.
Regarding Business Operations for Fiscal Year 2026
The start of operations for fiscal year 2026 is planned for mid-April, as in previous years, but this may change depending on weather conditions and facility maintenance status. If you are planning a visit, we recommend checking the latest information on the Yuzawa City official website.
Access Methods
Access by Car:
- Approximately 15 minutes from Yuzawa IC on the Yuzawa-Yokote Expressway
- Free parking available
Access by Public Transportation:
- Approximately 20 minutes by taxi from Yuzawa Station on the JR Ou Main Line
- Access by car is convenient due to limited bus service.
Inaniwa Castle is located in a mountainous area, making access by public transportation somewhat inconvenient. We recommend considering renting a car or arranging a taxi.
Nearby Tourist Attractions
Inaniwa Udon Village
Inaniwa-cho, Yuzawa City, is the birthplace of Inaniwa udon, one of Japan’s three great udon noodles. When visiting Inaniwa Castle, be sure to try authentic Inaniwa udon. There are factories where you can observe the manufacturing process and restaurants where you can enjoy freshly made Inaniwa udon scattered around the area.
Kawatsura Lacquerware Traditional Crafts Museum
A facility where you can learn about the history and manufacturing process of Kawatsura lacquerware. Workshops where you can actually experience making lacquerware are also held, allowing you to experience the depth of traditional crafts.
Koyasu Gorge Hot Springs
Located in the southern part of Yuzawa City, this scenic spot offers the beauty of the gorge and hot springs. It’s about a 30-minute drive from Inaniwa Castle, making it ideal to include in your sightseeing route.
Best Season to Visit Inaniwa Castle
Inaniwa Castle is open seasonally from mid-April to early November, but each season has its own unique charm.
Spring (Mid-April to May): This is the season of fresh greenery, and you can enjoy the beautiful scenery of the mountains covered in young leaves. It’s relatively uncrowded right after opening, allowing for a leisurely visit.
Summer (June to August): Inaniwa Castle stands out against the backdrop of deep green. The view from the observation deck is excellent, and on clear days you can see far into the distance.
Autumn (September to early November): This is the most recommended time to visit. The contrast between the mountains adorned with autumn foliage and Inaniwa Castle creates a breathtaking view. The best time to see the autumn leaves is especially from mid-to-late October.
How to Enjoy Inaniwa Castle | Recommended Points
For History Enthusiasts
For those who want to learn about the history of the Onodera clan and medieval mountain castles, we recommend carefully viewing the exhibits inside the castle. Each floor has detailed explanations, allowing you to gain a deep understanding of the Onodera clan’s rule over approximately 400 years.
Photo Spot
The view from the observation deck is an excellent photo spot. You can capture the beautiful scenery of Inaniwa village against the backdrop of the changing seasons. The luxurious interior of the Golden Room is also worth photographing (please check on-site whether photography is permitted).
For Families
The slope car is popular with children. Despite its mountain castle location, the slope car makes it easy to visit even with small children. The view from the observation deck is another element that families can enjoy.
Castle Stamp Collection
Castle stamps, popular among castle enthusiasts, are also sold at the entrance counter of Inaniwa Castle. The castle stamp, featuring the Onodera clan’s family crest, the “Rokuyo Mokko” (six-leaf quince blossom), and an illustration of Inaniwa Castle, is popular as a souvenir of the visit and as a collector’s item.
Many people visit Inaniwa Castle as part of a “castle tour” across Japan, and the castle stamp is cherished as a memento of their trip.
Points to Note When Visiting
Seasonal Openings
Inaniwa Castle is closed during the winter (mid-November to early April). Due to the heavy snowfall in the region, there are no winter operations. If you plan a visit, please be sure to check that it is within the operating period.
Checking Regular Closing Days
The castle is closed on Tuesdays, but if Tuesday is a public holiday, it will be closed the following day. Also, there may be temporary closures even within the operating period, so it is recommended to check in advance if you are visiting from afar.
Considerations Regarding Weather
Located in a mountainous area, the weather can change quickly. Especially if you want to enjoy the view from the observation deck, it’s recommended to visit on a sunny day.
Regional Development and the Role of Inaniwa Castle
Inaniwa Castle is not merely a tourist attraction; it plays a crucial role in conveying the region’s history and culture. Through the history of the Onodera clan, visitors can learn about the medieval history of southern Akita Prefecture, and the castle contributes to regional industrial development through the exhibition of traditional crafts such as Kawatsura lacquerware.
Furthermore, as a regional symbol alongside Inaniwa udon noodles, it plays a central role in promoting tourism in Yuzawa City and is a source of pride for the local people.
Summary | Enjoying History and Scenery at Inaniwa Castle
Inaniwa Castle is a replica castle built on the site of the former residence of the Onodera clan, who ruled southern Akita Prefecture for approximately 400 years from the Kamakura period. The castle displays items related to the Onodera clan and traditional local crafts, with the Golden Room on the 4th floor and the spectacular views from the observation deck being the main highlights. One of the attractions is access via the 237-meter-long slope car, the longest in Tohoku. Many tourists visit during its seasonal operation from mid-April to early November. The autumn foliage season, in particular, is especially beautiful, as the surrounding mountains change color, making the view from the observation deck even more stunning.
When visiting Inaniwa-cho in Yuzawa City, the home of Inaniwa udon noodles, be sure to also visit Inaniwa Castle and enjoy its history, culture, and beautiful scenery. Don’t forget to collect a castle stamp for a fulfilling castle-visiting trip.
Before visiting, check the operating period and closing days, and choose a day with good weather to fully experience the charm of Inaniwa Castle.
