Former Onoda Cement Manufacturing Co., Ltd. Shaft Kiln

Former Onoda Cement Manufacturing Company Vertical Kiln: Japan's Last Surviving Cement Kiln from the Meiji Era

Standing tall on the grounds of the Taiheiyo Cement Onoda Plant in Sanyo-Onoda City, Yamaguchi Prefecture, the Former Onoda Cement Manufacturing Company Vertical Kiln — affectionately known as the "Tokkuri-gama" (Bottle Kiln) — is Japan's only surviving cement-firing vertical kiln. Built in 1883 during the dawn of Japan's industrial modernization, this brick kiln was once one of four that fueled the nation's first privately established cement company. Today, it stands as a nationally designated Important Cultural Property, a silent yet powerful monument to the ingenuity and ambition that drove Japan's transformation from a feudal society into a modern industrial power.

The Birth of Japan's Cement Industry

The story of this remarkable kiln begins with Junpachi Kasai, a former samurai who, along with fellow ex-warriors, pooled their government pensions to establish the Cement Manufacturing Company in the town of Onoda in May 1881. This was the very first privately owned cement company in Japan — a bold venture during the Meiji era, when the nation was rapidly modernizing its infrastructure. In an era of global colonization, Kasai and his fellow industrialists were determined to build Japan's national strength through domestic industry rather than relying on foreign imports.

In 1883, four vertical kilns were constructed at the Onoda plant to produce Portland cement using the British wet-process method. The kiln that survives today is one of those original four. At its peak, the company operated as many as twelve of these bottle-shaped kilns, making Onoda the heart of Japan's cement production.

Why Was It Designated as an Important Cultural Property?

The vertical kiln was designated as a National Important Cultural Property on December 10, 2004 (Heisei 16), for several compelling reasons. Most significantly, it is the only cement-firing vertical kiln remaining intact anywhere in Japan. This makes it an irreplaceable artifact in the history of modern ceramic and kiln technology. The kiln represents the central production facility of the Onoda Cement Manufacturing Company, which played a pivotal role in supporting construction and modernization across western Japan. Furthermore, the kiln retains its complete foundation and structural elements, providing invaluable evidence for understanding the development of industrial kiln technology during the Meiji period. In 2017, it was also registered as a Mirai (Future) Technology Heritage, further affirming its significance in the story of Japanese technological innovation.

Architecture and Design of the Tokkuri-gama

The kiln's distinctive bottle-like shape earned it the nickname "Tokkuri-gama," after the traditional Japanese sake bottle it resembles. In Europe, kilns of this type were known as "Bottle Kilns" or "Bottle Ovens." Originally developed in 18th-century England, this rising-flame (ascending-flame) kiln design was introduced to Japan during the Meiji era for industrial cement production.

The structure consists of two main parts: a firing section and a chimney section, both constructed from brick masonry. The total height from the bottom of the fire mouth to the top measures approximately 18 meters, while the kiln body itself stands about 9.6 meters tall. Around 1897 (Meiji 30), the kiln was partially modified to increase its firing capacity. Raw materials — a mixture of limestone and clay — were loaded into the kiln and heated to produce "clinker," the intermediate material that is then ground into cement powder.

From Bottle Kiln to Rotary Kiln: A Story of Industrial Progress

The vertical kilns operated throughout the Meiji period, but advances in technology gradually rendered them obsolete. In 1898, Shinzo Kasai — the founder's son, who had studied in Germany — introduced two Dietzsch kilns on a trial basis. These newer kilns dramatically reduced firing time from seven full days and nights to just eight hours. By 1900, eight more Dietzsch kilns were added, and the vertical kilns became increasingly unnecessary.

By 1913 (Taisho 2), all vertical kilns had ceased operation, and all except the surviving one were dismantled. Meanwhile, Japan's first rotary kiln was installed at the Asano Cement plant in Fukagawa, Tokyo, in 1903, marking the beginning of the modern cement-manufacturing era. The sole surviving kiln at Onoda thus represents the final physical link to the earliest chapter of Japan's cement industry.

Highlights and What to See

Visiting the Tokkuri-gama is a unique experience that offers a glimpse into Japan's industrial heritage. A dedicated visitor walkway leads along the perimeter of the Taiheiyo Cement plant grounds, allowing close-up views of the kiln's impressive brick structure without entering the active factory. The towering form of the kiln, rising against the sky, evokes the scale and ambition of Meiji-era industry.

Near the main gate, visitors can also see the former Onoda Cement head office building, constructed in 1928 (Showa 3), which still serves as an office facility today. The surrounding area, including the kiln and its immediate environs, is designated as a Yamaguchi Prefectural Cultural Property under the name "Onoda Cement Tokkuri-gama" (designated February 4, 1969). From certain vantage points, you can see both the historic kiln and the modern rotary kilns operating on the same premises — a striking visual contrast spanning more than a century of cement-making technology.

Nearby Attractions

Sanyo-Onoda City, though not a major tourist destination, rewards curious visitors with a surprising array of cultural and natural sites. The Sanyo-Onoda City Museum of History and Folklore, located nearby, traces the region's history from ancient pottery and Sue ware production through the coal and cement industries that shaped the modern city. It was built in 1982 to commemorate the 40th anniversary of Onoda's incorporation as a city.

Wakayama Park, once the private garden of Junpachi Kasai himself, features a 3-meter-tall stone statue of the founder and is a lovely spot for cherry blossom viewing in spring, with about 300 cherry trees and 200 azalea bushes. The Onoda Cement Yamate Club, built in 1914 using concrete blocks that the company's fourth president brought back from England, is a fascinating example of early concrete architecture in Japan.

For nature lovers, Kirara Beach Yakeno, on the city's southwestern coast, is recognized as one of Japan's Top 100 Sunset Spots, offering stunning views of the sun sinking over the Seto Inland Sea. Eshi Park, with its serene lake and abundant hydrangeas, provides a peaceful retreat, while Ryuosan Park, set on a hilltop overlooking the Seto Inland Sea, offers panoramic views stretching to Kyushu and Shikoku on clear days.