Chestnut wood has been a part of Japanese life since ancient times, having been excavated from geological strata and numerous ruins from the Jomon period. It is thought that the area around the village that remains as ruins was a forest, and chestnuts were an important food for the Jomon people, and chestnut trees were a familiar presence. Eventually, he realized that chestnut wood was durable and resistant to rot, and that chestnut wood was also used in the construction of houses. The secret to chestnut wood’s resistance to rotting lies in the component called tannin contained in the wood. Because it does not attract insects and makes it difficult for bacteria to grow, it is resistant to rotting and maintains high durability even in harsh environments where it is exposed to rainwater. It is proven to be highly durable, as it is often used for the foundations of houses in the Japanese environment where termite damage is expected. Chestnut wood is also used in the main parts of the historical buildings in Shirakawa-go, Gifu Prefecture, a World Cultural Heritage Site, and the Gassho-zukuri townscape remains as beautiful as ever, even though it has been over 300 years since its construction. Chestnut wood has a Japanese Style image, but its calm, slightly gray color and clear, beautiful wood grain are also appealing because it goes well with Western-style. However, the number of large chestnut trees in Japan that are used for building materials is decreasing year by year, and the premium line’s single-board Shinano chestnuts are a rare and valuable product, accounting for only 5% of the amount.