Dōtaku: Ancient Bronze Bells That Echo the Prayers of Yayoi Japan

Deep in the mountains on the southern slopes of Mount Rokkō in Kobe, an extraordinary discovery was made in December 1964. Workers extracting clay for building materials accidentally unearthed a cache of 14 bronze bells (dōtaku) and 7 bronze halberds (dōka) that had been deliberately buried together over 2,000 years ago during Japan's Yayoi period. Known as the Sakuragaoka Dōtaku and Dōka Group, this remarkable collection was designated a National Treasure in 1970 and is now permanently housed at the Kobe City Museum in the heart of the city's former foreign settlement district.

These mysterious bronze ritual instruments offer a rare window into the spiritual life of ancient Japan — a time when communities along the fertile plains of western Japan conducted agricultural ceremonies with bells whose resonant tones were believed to invoke blessings for bountiful harvests. Today, visitors from around the world can admire these treasures up close and contemplate the lives of the people who crafted and revered them.

What Are Dōtaku? Understanding Japan's Ritual Bronze Bells

Dōtaku are bell-shaped bronze vessels unique to Japan's Yayoi period, roughly spanning from the 3rd century BC to the 3rd century AD. Scholars believe they evolved from smaller bells and chimes originally introduced from the Korean Peninsula and mainland China, gradually developing into a distinctly Japanese form. Early dōtaku were small enough to be held and rung using an internal clapper (zetsu), producing a clear, resonant sound. Over time, however, they grew larger and more elaborately decorated, eventually losing their sound-producing function and becoming purely visual objects used in agricultural rites and community rituals.

Dōtaku have been found predominantly in western Japan, with the Kinki region (the area around modern-day Osaka, Kyoto, Nara, and Hyōgo) being the center of their distribution. Hyōgo Prefecture alone has yielded 67 dōtaku — the highest number of any prefecture in Japan — underscoring the region's importance as a heartland of Yayoi ritual culture.

The Dramatic Discovery at Sakuragaoka

On December 10, 1964, workers digging for wall-building clay on a steep hillside at an elevation of approximately 243 meters in Kobe's Nada Ward made an astonishing find. Buried in a northeast-facing slope, with only a distant view of the Ashiya area to the east, lay 14 bronze bells and 7 bronze halberds — all deposited together in what archaeologists call a "mass ritual burial" (ikkatsu mainō). The remote, hard-to-access location of the burial site suggests that the items were intentionally hidden away, perhaps at a moment of great social change or crisis.

The discovery sent shockwaves through the archaeological community. At the time, it was one of the largest single caches of dōtaku ever found, comparable only to the famous Ōiwayama find in Shiga Prefecture. The bells and halberds were initially designated as Important Cultural Properties in 1969, and just one year later, on May 25, 1970, they were elevated to the status of National Treasure — Japan's highest designation for cultural heritage.

Why the Sakuragaoka Dōtaku Are a National Treasure

The National Treasure designation recognizes three extraordinary characteristics of the Sakuragaoka collection:

First, the sheer scale of the mass burial is exceptional. Having 14 dōtaku and 7 dōka buried together at a single site provides invaluable evidence about how these ritual objects were used and ultimately decommissioned. Similar mass burial sites are known at Kamō Iwakura in Shimane Prefecture (39 dōtaku) and Ōiwayama in Shiga Prefecture (24 dōtaku), but the Sakuragaoka group remains one of the most significant for its combination of bells and halberds.

Second, four of the 14 bells (Bells No. 1, 2, 4, and 5) feature pictorial engravings on their surfaces — images of people, animals, and insects that are among the oldest figurative artworks in Japanese history. These illustrations depict scenes of daily life: humans wielding tools, deer, tortoises, dragonflies, praying mantises, cranes, and fish. These drawings are considered invaluable primary sources for understanding the lives and beliefs of Yayoi people.

Third, the 14 bells span multiple stages of dōtaku typological evolution. They range from the earlier "externally flanged loop" type (gaien-tsuki chū-shiki) to the later "flattened loop" type (henpei chū-shiki), suggesting that the collection was accumulated over a significant period before being buried together — estimated to have occurred around the late Middle to early Late Yayoi period.

Highlights and Must-See Features

The Kobe City Museum: A Treasure House in the Former Foreign Settlement

The Kobe City Museum itself is a cultural gem. The neoclassical building, designed by architect Kōtarō Sakurai and completed in 1935, originally served as the Kobe branch of the Yokohama Specie Bank. With its impressive Greek-style columns stretching 50 meters along the facade, the building is a nationally registered Tangible Cultural Property and a designated Modern Industrial Heritage site. The museum opened in 1982, merging the city's former archaeological museum and Namban Art museum into a single institution.

Beyond the dōtaku collection, the museum houses approximately 80,000 items, including the celebrated Portrait of Saint Francis Xavier (Important Cultural Property), an outstanding Namban art collection documenting Japan's early encounters with European missionaries and traders, and extensive collections of antique maps and glass art. The first floor, which features a free exhibition on the History of Kobe, is well worth visiting even on a quick stop.

Visiting the Discovery Site

For those who wish to go beyond the museum, the actual discovery site in Nada Ward can be visited via a hiking trail on the southern slopes of Mount Rokkō. Local volunteers known as the "Ichiōzan Moriage-tai" have worked together with the city to maintain trails and install information boards. The nearest bus stop is "Takahachō" on the Kobe City Bus network. In 2023, the city erected a new explanatory panel at the site, and full-size replicas of the dōtaku and dōka, created by students of Hyōgo Prefectural Aioi Industrial High School, have been installed for visitors to appreciate.

Additionally, the Kobe Archaeological Center in Nishi Ward displays various cultural artifacts from across the city and features a park where visitors can actually ring replicas of the Sakuragaoka dōtaku, experiencing firsthand the sounds that once echoed across Yayoi-period landscapes.

Nearby Attractions

The Kobe City Museum is located in the Kyū-kyoryūchi (Former Foreign Settlement) district, one of Kobe's most elegant neighborhoods. Within walking distance, visitors can enjoy a wealth of sights and experiences:

• The Kitano Ijinkan (Foreign Houses) district, featuring beautifully preserved Western-style residences from the Meiji era, is about 15 minutes on foot to the north.
• Meriken Park and the Kobe Port Tower offer waterfront scenery and the Kobe Maritime Museum, approximately 10 minutes south on foot.
• Nankinmachi (Kobe Chinatown), one of Japan's three major Chinatowns, is just a few minutes' walk west of the museum.
• The Hyōgo Prefectural Museum of Art, designed by Tadao Andō, is accessible via a short train ride along the coast.
• Mount Rokkō, where the dōtaku were originally discovered, offers hiking, panoramic views of the city, and seasonal attractions including an alpine botanical garden.