Hiraide Ruins
The nationally designated Hiraide Ruins rank among Japan’s three major archaeological sites. Situated about 2 kilometers southwest of JR Chuo Main Line Shiojiri Station, they lie on Kikyogahara, a vast stretch of vineyards. The site extends in a band along the Shibukawa, which flows from Hirade Spring, spanning about one kilometer east to west and 300 meters north to south.

Major excavations that began in 1950 revealed that people lived at Hiraide from the Jomon period through the Heian period.
Numerous dwelling remains and associated artifacts were unearthed. These abundant finds became fundamental sources for studying prehistoric and ancient cultures in the region, and the site received National Historic Site status in 1952. Excavations have continued since then, and to date more than 290 dwelling and building remains have been discovered.

◇Hiraide Museum
The museum displays clay figures, pottery, stone tools, ironware and other items excavated from the Hiraide Ruins, along with artifacts from other sites in the city. Highlights include the prefectural treasures such as the green-glazed water jar, the Shibamiya Bronze Bell, the Shobuzawa Gatou, and distinctive Jomon pottery of Shinshu.

◇Historic Park
Around the museum is the Hirade Kofun Group, three burial mounds believed to belong to powerful local leaders who governed the Hiraide settlement. You can also see a pit-dwelling reconstructed for the first time nationwide as an ancient structure.

◇Hiraide Ruins Park
Hiraide Ruins Park reconstructs villages from the Jomon, Kofun and Heian periods under the theme "Five thousand years of Hiraide." The park features 15 reconstructed dwellings and buildings that visitors can enter.
Each dwelling recreates life in the Jomon, Yayoi and Heian periods, allowing visitors to experience firsthand changes in house structure and materials and to feel how people’s lives transformed across the ages.

◇Guidance Building
The Guidance Building offers a guidance corner, rest area and an observation room, creating a relaxed space where visitors can learn about the Hiraide Ruins. Hands-on activities related to prehistory and ancient times, such as fire starting and making magatama (curved beads), are held here and are popular with local children.
On the second floor, an observation room provides a panoramic view of the ruins park.

◇Basic Information
<Historic Park / Hiraide Museum>
Address: 1011-3 Soga, Shiojiri City, Nagano Prefecture
Phone: 0263-52-1022
Hours: 9:00–17:00 (last admission 16:30)
Closed: Mondays, the day after public holidays, and during the New Year holidays (December 29–January 3)
Parking: Cars: 50 spaces / Large buses: 10 spaces (free)
Admission (※): General: 300 yen / Elementary and junior high school students: free / Groups of 20 or more: 240 yen per person
※From April 1, 2026: General: 400 yen / Elementary and junior high school students: free / Groups of 20 or more: 320 yen per person
Access: 15-minute walk from JR Shiojiri Station / Immediately at Community Development Bus Soga Line Hirade Museum bus stop

<Ruins Park / Guidance Building>
Address: 388-2 Soga, Shiojiri City, Nagano Prefecture
Phone: 0263-52-3301
Hours: 9:00–17:00
Closed: Mondays, the day after public holidays, and during the New Year holidays (December 29–January 3)
Parking: Available (free)
Reception hours: 9:00–11:00 and 13:00–15:30
Admission: Free (materials fees may apply for certain experiences)
Access: 15-minute walk from JR Shiojiri Station or 6 minutes from Community Development Bus Soga Line Hirade Tsumesho-mae Bus Stop