Maruya: A Surviving Hatago Inn of Kamagaya-juku on the Kioroshi Kaido

Tucked away along a quiet stretch of road in Kamagaya City, Chiba Prefecture, a weathered two-story wooden building stands as a rare survivor of Japan's post-town heritage. This is Maruya, a former hatago (traveler's inn) that once served weary wayfarers along the Kioroshi Kaido, one of the important secondary highways of the Edo period. Registered as a national Tangible Cultural Property in August 2020, Maruya is the first building in Kamagaya City to receive this distinguished recognition, making it a quietly significant destination for anyone with an interest in Japan's grassroots architectural history.

The Kioroshi Kaido: A Highway for Fresh Fish and Literary Travelers

To understand Maruya, one must first understand the road it was built to serve. The Kioroshi Kaido was a vital secondary highway that connected the port of Gyotoku (present-day Ichikawa City) on the Edogawa River with the Kioroshi riverbank (present-day Inzai City) on the Tone River. During the Edo period, this route served as the shortest overland connection between Edo (Tokyo) and the lower Tone River region, and it became particularly famous as a route for transporting fresh fish from Choshi and Kashima to the Nihonbashi fish market in Edo. For this reason, it was sometimes called the "Sengyo Michi" (Fresh Fish Road).

Six post towns were established along the highway: Gyotoku, Yawata, Kamagaya, Shiroi, Omori, and Kioroshi. Kamagaya-juku, located at a key crossroads, grew steadily as river traffic on the Tone increased. At its peak around 1800, the post town boasted one wholesale agent and seven hatago inns. The highway attracted a remarkable roster of literary and intellectual travelers: the haiku master Matsuo Basho passed through in 1687 on his journey to Kashima; the painter and scholar Watanabe Kazan stopped at a rival inn called Kashimaya in 1825; and in 1838, the agrarian reformer Ohara Yugaku specifically recorded staying at Maruya in his diary, the "Seigaku Nikki."

History of Maruya: From Post-Town Inn to Cultural Property

Maruya's history is marked by resilience. The original inn building was destroyed in a great fire that swept through Kamagaya in 1893 (Meiji 26). Over the following three to four years, the building was reconstructed in its current form, completed around 1897 (Meiji 30). By 1902 (Meiji 35), however, the inn had ceased operating as a hatago. The Meiji government's abolition of the old post-station system and the rapid development of railways and steamships had gradually eroded Kamagaya's role as a post town, reducing the number of inns from seven to just four by 1874, and eventually making the lodging business unsustainable.

After closing as an inn, Maruya was converted into a private residence in the late Meiji period, and then further renovated in 1956 (Showa 31) for use as an apartment building. Despite these changes, the building has retained key elements of its original character as a hatago. On August 17, 2020, it was registered as a national Registered Tangible Cultural Property (building) — the first such designation in Kamagaya City's history, along with the nearby Shibuya family residence.

Architectural Features: Reading the Story in Wood and Tile

Maruya is a two-story wooden structure with a hip roof (yosemune-zukuri) covered in san-kawara tiles, with a building area of approximately 133 square meters. It spans five ken in width and seven ken in depth. While the interior floor plan was altered during later renovations, many original structural elements remain intact. The pillars and crossbeams are notably thick and sturdy, reflecting the robust construction typical of commercial buildings designed to accommodate many guests.

The most distinctive feature is the front entrance, which preserves an agedogamae — a type of sliding shutter arrangement once common in merchant and inn buildings along Japanese highways. Together with the projecting eaves (hisashi) above the entrance, these elements evoke the atmosphere of the old post town in a way that no other building in Kamagaya can. The steep pitch of the tiled roof is believed to date from the original reconstruction, representing a transitional form from the earlier thatched-roof style.

Maruya Hanare: The Annex with an Imperial Connection

Adjacent to the main building stands the Maruya Hanare (annex), a single-story wooden structure also with a hip roof and tiled roofing. Built around the same period as the main building (circa 1897), the annex carries a remarkable tradition: it is said that in 1898 (Meiji 31), the Crown Prince — the future Emperor Taisho — stayed at this annex during a regional visit (gyokei). This imperial connection adds another layer of historical significance to the property. The annex features a characteristic gabled porch (geya) at the center of its facade, with a formal entrance and a traditional layout placing the main reception room to the northwest and the earthen-floor work area to the southeast. The Maruya Hanare is also registered as a Tangible Cultural Property.

Why Was Maruya Registered as a Cultural Property?

Maruya was registered under the criterion of "contributing to the historical landscape of the national territory." This recognition reflects the building's role as the sole surviving physical reminder of Kamagaya's past as a post town on the Kioroshi Kaido. While the post town's layout and most of its buildings have long since been absorbed into the modern cityscape, Maruya stands as tangible evidence of the vibrant commercial and cultural life that once animated this stretch of highway. Its thick-timbered construction, entrance shutters, and eaves preserve authentic architectural vocabulary of late Meiji-era inn buildings — a building type that has nearly vanished from the Japanese landscape.

Visiting Maruya: What to Know Before You Go

Maruya is located along the old Kioroshi Kaido (present-day Prefectural Route 59) in Kamagaya City. The nearest station is Kamagaya-Daibutsu Station on the Shin-Keisei Line, from which the building is within easy walking distance. However, visitors should be aware that Maruya is privately owned and currently used as a residential property, so entry to the grounds is not permitted. The building can be appreciated from the street, where its distinctive two-story form and tiled roof are clearly visible amid the surrounding modern buildings.

The best way to visit Maruya is as part of a walking tour of the old Kioroshi Kaido route through Kamagaya. The area retains subtle traces of its post-town past, and the journey offers a meditative contrast to the bustling tourist destinations of nearby Tokyo.

Nearby Attractions and Points of Interest

A visit to Maruya pairs well with several other local highlights. Just a short walk from Kamagaya-Daibutsu Station stands the Kamagaya Daibutsu, a seated bronze Buddha statue cast in 1776 by a wealthy local merchant. At just 1.8 meters tall, it is famously modest in size — a charming counterpoint to the colossal Buddhas of Nara and Kamakura — and is designated as Kamagaya City's first cultural property. Nearby, the Grave of Government Army Soldiers marks the site of a Boshin War skirmish in 1868.

The Kamagaya City Local History Museum offers exhibits on the area's post-town heritage, Kioroshi Kaido history, and archaeological finds. For a more leisurely experience, Kaigara-yama Park provides pleasant green space for walking. Baseball fans may also enjoy visiting the Kamagaya Stadium, the training facility for a professional baseball team. The Shin-Kamagaya Station area, where four railway lines converge, offers convenient access to Narita Airport, Matsudo, Funabashi, and central Tokyo.