The Tenri City Kurozuka Kofun Museum is a historical museum located in Tenri City, Nara Prefecture. It opened on October 12, 2002, to introduce visitors to the archaeological discoveries and cultural heritage of the Kofun period, an era when powerful leaders built monumental burial mounds across Japan.
The museum was established following the major archaeological excavations at Kurozuka Kofun in 1998. These investigations uncovered numerous grave goods, including 33 triangular-rimmed bronze mirrors decorated with deities and animals. By presenting replicas, reconstructions, and explanatory displays, the museum makes these important discoveries accessible to the public and helps visitors understand their historical and cultural significance.
One of the museum’s main attractions is a full-scale reconstruction of the vertical stone burial chamber discovered inside Kurozuka Kofun. Measuring approximately 8.3 meters in length, the model recreates the size and structure of the original chamber, allowing visitors to appreciate the confined space in which the deceased was laid to rest.
The first floor also features detailed replicas of excavated artifacts, including iron objects and tools, together with explanatory panels. These displays illustrate the craftsmanship, burial customs, and material culture of the early Kofun period.
The second floor displays precise replicas of the 33 triangular-rimmed deity-and-animal mirrors and one mirror decorated with figures and patterned bands found at Kurozuka Kofun. The replicas reproduce the designs of the original artifacts, helping visitors examine their elaborate decoration and understand their role as prestigious burial objects.
The original mirrors have undergone preservation treatment and are kept under secure conditions at the Nara Prefectural Archaeological Institute of Kashihara. The museum’s replicas allow visitors to appreciate these remarkable objects while the originals remain protected.
Opening hours: 9:00 a.m.–5:00 p.m.
Closed: Mondays. When a national holiday falls on a Monday, the museum is also closed on the following day. The museum is also closed on public holidays.
Admission: Free
The museum is conveniently located approximately 5 minutes on foot from Yanagimoto Station on the JR Sakurai Line, making it easy to reach by public transportation.
Kurozuka Kofun is a keyhole-shaped burial mound in Yanagimoto-cho, Tenri City, measuring approximately 130 meters in length. Designated a National Historic Site of Japan, it became nationally renowned following archaeological excavations conducted from 1997 to 1998, when 33 triangular-rimmed bronze mirrors were discovered in positions that largely preserved their original burial arrangement.
The discovery provided exceptionally valuable evidence of early Japanese funerary practices and the use of prestigious objects in elite burials. The museum offers an accessible introduction to these findings and explains why the site occupies such an important place in the study of ancient Japanese history.
Kurozuka Kofun belongs to the Yanagimoto Kofun Group in the southeastern part of the Nara Basin. Built along the edge of a natural plateau, it takes advantage of the surrounding terrain. Its keyhole-shaped design consists of a circular rear section and an elongated front section, a characteristic form of early monumental tombs.
The mound measures approximately 130 meters in length. Its rear section has a diameter of about 72 meters and a height of approximately 11 meters. The front section spreads outward in a slightly fan-shaped form and has a two-tier structure, while the rear section has three tiers. A surrounding moat is also present, although neither haniwa clay figures nor surface-covering stones have been confirmed; they may never have been part of the original design.
The excavation revealed that bronze mirrors had been positioned upright around the wooden coffin, accompanied by swords, arrowheads, and numerous small armor components. The mirrors and weapons appear to have been arranged in a U-shaped configuration around the deceased, a layout that researchers have suggested may have held ritual or protective significance.
One mirror decorated with figures and patterned bands was placed inside the coffin near the deceased’s head, with a sword and another blade positioned alongside it. Outside the coffin, 15 mirrors stood along one side of the burial chamber and 17 along the other, accounting for 32 of the triangular-rimmed mirrors. Together with the additional mirror inside the coffin, the arrangement illustrates the remarkable care taken in preparing the burial.
Another intriguing discovery came from the northeastern corner of the burial chamber. Archaeologists found two U-shaped iron bars, one larger and one smaller, connected by a V-shaped tubular component. Its original function remains uncertain, and research continues into the purpose of this unusual object.
The burial facility is a vertical stone chamber whose roof was constructed from flat stones sourced from Mount Nijō, arranged in a distinctive structure resembling two hands joined together. This unusual roofing method is considered a rare and valuable example of ancient stone construction.
At some point during the medieval period, an earthquake caused the roof to collapse. Archaeological investigations found that the fallen slabs had covered the floor of the chamber, providing important evidence of the damage and the chamber’s subsequent history.
During the Kamakura period, a large robbery pit was dug into the central part of the burial chamber. However, the collapsed roof stones appear to have prevented the intruders from reaching much of the burial’s contents. As a result, many of the grave goods remained undisturbed.
This unusual sequence of events helped preserve an extraordinary collection of archaeological evidence. The accidental protection provided by the fallen stones has made Kurozuka Kofun especially valuable for understanding how burial objects were arranged during the early Kofun period.
Kurozuka Kofun continued to play a role in local history long after its original use as a tomb. During the later Muromachi period, the Yanagimoto clan used the mound as a defensive stronghold. The area later came under the control of the warlord Matsunaga Hisahide.
During the Edo period, descendants of Oda Nagamasu, the younger brother of Oda Nobunaga, governed the Yanagimoto domain. The ancient mound was incorporated into the grounds of the domain’s administrative residence, demonstrating how an archaeological monument could become part of a later political and military landscape.
The Tenri City Kurozuka Kofun Museum and the nearby burial mound offer much more than a glimpse of an ancient archaeological site. Together, they provide an opportunity to explore the burial customs, artistic achievements, and beliefs of the society that emerged during the early Kofun period.
Visitors can examine the full-scale burial chamber reconstruction, study the intricate designs of the bronze mirror replicas, and then visit Kurozuka Kofun itself to appreciate the monument in its original landscape. For anyone interested in archaeology and the origins of Japanese civilization, the museum is a rewarding stop when exploring the historic sites of Nara Prefecture.