What Is an Akagi-Style Folk House?
The Akagi-style folk house is a traditional farmhouse architectural style that developed mainly along the southern foothills of Mount Akagi in Gunma Prefecture. Its most distinctive feature is the large opening cut into the center of the front section of the thatched hipped or irimoya-style roof.
This opening creates windows and ventilation spaces on the upper floor. The design was developed specifically for silkworm cultivation, allowing sunlight and fresh air to reach the silkworm-rearing rooms located beneath the roof.
A raised ventilation structure known as a yagura, or udatsu, was also installed along the roof ridge. It helped regulate temperature and humidity inside the house, creating a more suitable environment for raising silkworms.
The architectural style reflects a period when sericulture was an important source of cash income for farming families. Its basic form emerged around the mid-18th century and continued to develop through the Meiji period as sericulture became increasingly prosperous. The Akagi-style house can therefore be understood as an example of architecture shaped directly by the needs of a major local industry.
A Historic House Relocated from Maebashi
The Akagi-style house now standing at Gunma Insect World was originally the Kakinuma family residence in Tomita, Maebashi City. It was built during the early Meiji period and was relocated and restored at its present location in 2001.
The two-story wooden structure features an irimoya-style roof covered with thatch, giving it an impressive appearance that conveys the scale and craftsmanship of traditional farming houses of the period.
The western side of the house was primarily used as living quarters, while the eastern side contained a large earthen-floor work area and a horse stable. During the silkworm-rearing season, the tatami mats on the first floor could be removed so that the entire space could also be used for raising silkworms.
The second floor consists largely of a spacious silkworm-rearing room. Soft natural light enters through the distinctive opening on the south side of the roof. Inside, traditional features such as an irori hearth, cooking stove, storage room, and tokonoma alcove help recreate the atmosphere of a historic rural home.
Traditional Wisdom Seen in the Irori Hearth and Earthen Floor
Visitors enter the house through a large earthen-floor area, with the horse stable located on the eastern side. Horses were essential to agricultural work and were treated as important members of the household.
An irori hearth and traditional cooking stove were located toward the northern side. Smoke from the fire rose through the house toward the roof, helping protect the wooden structure and thatching from insects and decay.
This simple arrangement demonstrates the practical knowledge developed by generations of farmers. The same fire that provided warmth and allowed food to be cooked also contributed to maintaining the traditional thatched roof and wooden structure.
The preserved wooden floors, tatami rooms, household altar, storage spaces, and other features allow visitors to study the layout and everyday functions of an Akagi-style farmhouse while imagining how rural families once lived and worked.
Hands-On Experiences of Sericulture and Rural Life
From spring through autumn, visitors can sometimes observe actual silkworm-rearing activities inside the house. Traditional equipment is used to demonstrate various stages of sericulture.
Activities include placing silkworm trays inside the house, feeding silkworms fresh mulberry leaves in a process known as kuwa-kure, collecting cocoons through mayu-kaki, and winding silk thread using a traditional hand-operated device known as a zaguri.
Visitors may also have opportunities to observe silkworms under a microscope and touch actual cocoons. These hands-on experiences make it easier for both children and adults to understand how silk was produced and how closely sericulture was connected with everyday rural life.
Traditional Games and Seasonal Flowers
The spacious garden around the house also provides opportunities to experience traditional Japanese children’s games, including ring toss, bamboo stilts, kendama, and bamboo propellers.
The garden changes with the seasons. Cherry blossoms and rapeseed flowers appear in spring, hydrangeas brighten the grounds in summer, while red spider lilies and autumn foliage can be enjoyed in autumn. In winter, visitors may encounter wintersweet and plum blossoms.
Gunma Insect World — An Educational Experience in Nature
The Gunma Insect World, where the Akagi-style folk house is located, is a unique educational nature facility covering approximately 45 hectares. Its extensive grounds recreate a traditional satoyama landscape with wooded areas, farmland, streams, ponds, and grassland.
The facility is particularly distinctive because it is known as Japan’s only insect-focused facility operated by a prefectural board of education. Visitors can learn about insects while experiencing the relationship between people, agriculture, and the natural environment.
The Insect Observation Center and Tropical Greenhouse
The central Insect Observation Center allows visitors to observe insects and other creatures from Japanese satoyama environments, as well as species from around the world throughout the year.
One of the highlights is the enormous glass-domed greenhouse. Inside, numerous butterflies fly freely through a warm, subtropical environment complete with flowing water and lush vegetation. The large tree nymph butterfly, one of Japan’s largest butterflies, is among the species visitors may encounter.
The immersive environment provides an opportunity to observe insects at close range while experiencing a landscape quite different from the surrounding Japanese countryside.
Exploring Insects in the Extensive Outdoor Field
The outdoor fields provide opportunities to search for insects in their natural surroundings. The grounds include woodlands, open grassland, ponds, and other habitats, each supporting different species depending on the season.
Visitors can find and carefully observe insects before returning them to the place where they were discovered. This approach encourages a deeper understanding of living creatures and the importance of respecting the natural environment.
Where Nature and History Come Together
The Akagi-style folk house is much more than a preserved historic building. Its location within Gunma Insect World creates a unique opportunity to experience the connections between traditional architecture, the silk industry, rural life, and the natural environment.
Visitors can move from the historic farmhouse to the surrounding satoyama landscape and then explore the insect exhibits and outdoor fields. Together, these experiences reveal how people and nature have interacted in the foothills of Mount Akagi over generations.
Preserving Satoyama Culture for Future Generations
Sericulture was one of the industries that contributed significantly to the modernization and economic development of Gunma Prefecture. The Akagi-style folk house is a valuable reminder of that history and of the farming families whose lives were closely connected with silkworm cultivation.
Visiting the house together with Gunma Insect World provides a deeper understanding of how the natural resources of the satoyama supported traditional livelihoods, while also demonstrating how those cultural traditions are being preserved and introduced to new generations.
Surrounded by seasonal scenery and the rich natural environment of the Akagi foothills, the Akagi-Style Folk House offers a quiet journey into Japan’s rural past. For travelers interested in traditional Japanese architecture, silk production, countryside culture, or hands-on nature experiences, it provides an opportunity to discover a distinctive part of Gunma’s heritage.