Kugurizuka Kofun: A Fourth-Century Burial Mound at the Edge of Old Kyushu
Kugurizuka Kofun is a round burial mound about 30 meters across, raised in the early fourth century on a low hill in the eastern part of Omuta, Fukuoka Prefecture. When the Omuta City Board of Education opened it in 1959, archaeologists found two stone coffins set side by side at its center, along with bronze mirrors, dozens of bronze arrowheads, and a range of iron tools. The finds were rich enough to make the small mound widely known, and on February 17, 1977 it was designated a National Historic Site.
The hill sits close to the old border between Chikugo and Higo, the historic provinces that roughly correspond to today's southern Fukuoka and Kumamoto. That position matters. Researchers regard Kugurizuka as marking the southern edge of the early mounded tombs that spread through northern Kyushu, which makes it a useful marker for how the practice of building kofun first reached this part of the island.
The Mound and Its Two Coffins
The mound now stands roughly 6.5 to 7 meters high, though its original height is estimated at around 8 meters. The lower third was not piled up at all. Instead, builders carved it directly out of the natural ridge and then heaped earth on top, a shortcut that took advantage of the rise the hill already offered.
At the center lie two box-shaped coffins assembled from cut stone slabs, laid roughly north to south and running parallel. This slab-built form, known in Japanese as hako-shiki sekkan, was not borrowed from elsewhere. It continued a burial style that communities in northern Kyushu had used since the preceding Yayoi period, and its presence here is one reason the tomb is read as a strongly local creation.
The eastern coffin, designated No. 1, was cut from tuff and measures about 1.7 meters long inside, with a single slab for a lid. Head-sized stones were packed around it, and the interior was coated with red ochre, a pigment long associated with burial across the archipelago. The western coffin, No. 2, was built about 1.3 meters away from sandstone slabs and carries a small side chamber at one end. One detail of sequence is telling: No. 2 was constructed partly by breaking into No. 1, so the eastern coffin must have received its occupant first.
No clay figures (haniwa) and no stone facing (fukiishi) have been found on the mound, an absence consistent with its early date.
What the Graves Held
The two coffins were furnished differently, and the contrast is part of what makes the site interesting. Inside the eastern coffin, alongside human bones, lay a bronze mirror cast with images of deities and dragon-and-tiger motifs (a shinjin ryuko gazo kyo) and two tubular beads of the type called kudatama. Outside the coffin were an iron sword, two small knives, an iron sickle, a hoe blade, and a plane.
The western coffin held a fragment of a different mirror, a Chinese-style piece decorated with an inward-curving floral pattern (a naikokamon kyo). It had been deliberately broken, then ground smooth into a crescent shape and pierced with two holes, most likely so it could be worn or hung. Outside this coffin the excavators recovered an unusually large group of grave goods: 47 bronze arrowheads, an iron spade tip, a sickle, two planes, two axes, assorted other iron pieces, and two jars of Haji earthenware.
It is the bronze arrowheads that catch a specialist's eye. Items like these reflect the material culture of the Kinai region, the heartland of the emerging Yamato polity around present-day Nara and Osaka. So while the coffins themselves speak of local Kyushu tradition, the offerings inside and around them point toward connections with central Japan. The grave goods are otherwise typical of early kofun and carry little distinctly regional character, which makes the combination all the more worth examining.
Why It Was Designated
Kugurizuka earned national protection because it captures a moment of transition. Mounded tombs first appeared in central Japan and then spread outward, and Kyushu received the practice comparatively late and unevenly. A tomb that pairs an old northern-Kyushu coffin tradition with grave goods echoing the Kinai shows that meeting of styles in physical form. For anyone studying how kofun culture took root at the southern reaches of its spread, the mound is a concrete reference point rather than a guess drawn from texts.
Visiting the Site
The mound rises on a hill reached by passing to the right of the main hall of Hayame Tenmangu, a local shrine. From Fukuoka Prefectural Route 788, the path begins on the east side of the signal near Hayame-kita Elementary School. The approach is on foot only; cars cannot reach the mound, and the entrance is easy to miss, so it helps to know in advance that you are looking for a footpath up a modest rise. From the top there is an open view over the surrounding townscape.
The mound today is a grassy rise marked by an explanatory board rather than a reconstructed monument, so the real reward of the visit is the artifacts. These are displayed at the Omuta City Miike Karuta and History Museum, where the mirrors, beads, and metalwork from the coffins can be seen up close. Admission is free, and the museum stands about a ten-minute walk from Omuta Station.
Nearby
Omuta is best known today for coal rather than kofun. The Manda Pit and the Miyanohara Pit, two shaft-mine sites from the Miike coalfield, together with Miike Port, were inscribed in 2015 as part of the UNESCO World Heritage Site "Sites of Japan's Meiji Industrial Revolution: Iron and Steel, Shipbuilding and Coal Mining." A day that begins at a fourth-century grave and ends among the brick winding-houses of an early twentieth-century mine covers an unusually wide stretch of the region's history. The Miike Karuta and History Museum is itself a fitting stop, since Omuta is remembered as a birthplace of karuta playing cards in Japan.
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Q&A
- When was Kugurizuka Kofun built?
- It dates to the early fourth century, in the early part of the Kofun period. Recent research places it fairly early even within that span.
- What was found inside?
- Two stone coffins yielded human bones, two bronze mirrors (one a deity-and-beast image mirror, one a fragment of a floral-pattern mirror), tubular beads, 47 bronze arrowheads, and an array of iron tools such as a sword, knives, sickles, axes, and planes, plus Haji earthenware jars.
- Why is it considered important?
- It combines a slab-coffin burial style rooted in northern Kyushu's Yayoi tradition with grave goods that point toward the Kinai region. As such it documents how kofun culture reached the southern edge of its spread.
- Can I go inside the mound?
- No. The coffins were investigated in 1959 and are not open to the public. Visitors see the grassy mound and an explanatory board; the excavated objects are displayed at a museum in the city.
- Where can I see the artifacts?
- At the Omuta City Miike Karuta and History Museum, roughly a ten-minute walk from Omuta Station. Admission is free.
Basic Information
| Name | Kugurizuka Kofun |
|---|---|
| Location | Kogane-machi 1-429, Omuta City, Fukuoka Prefecture |
| Designation | National Historic Site (designated February 17, 1977) |
| Type | Round burial mound (empun), early Kofun period, early 4th century |
| Scale | Diameter about 30 m; current height about 6.5 to 7 m (original height estimated at about 8 m) |
| Main structure | Two box-shaped assembled stone coffins (slab-built cists) |
| Excavation | Investigated by the Omuta City Board of Education in 1959 |
| Access | On foot from near Hayame Tenmangu shrine; no vehicle access to the mound |
| Artifacts | Displayed at the Omuta City Miike Karuta and History Museum (free admission) |
References
- National Database of Designated Cultural Properties, Agency for Cultural Affairs: Kugurizuka Kofun
- https://kunishitei.bunka.go.jp/bsys/maindetails/401/2677
- Cultural Heritage Online (Agency for Cultural Affairs): Kugurizuka Kofun
- https://online.bunka.go.jp/heritages/detail/211400
- Crossroad Fukuoka (Fukuoka Prefecture Official Tourism Site): Kugurizuka Kofun
- https://www.crossroadfukuoka.jp/spot/14894
- Omuta City: Miike Karuta and History Museum
- https://www.city.omuta.lg.jp/kiji0032802/index.html
- Omuta Modern Industrial Heritage: Overview (Sites of Japan's Meiji Industrial Revolution)
- https://www.miike-coalmines.jp/outline.html
Last verified: 2026.05.29