The Old Tanaka Ban Museum was initially the Katsunuma Post and Telegraph Bureau. Built in the third decade of the Meiji Period (around 1900), it is an elegant Western-style building with an East Asia hip-and-gable roof structure built by Terushige Matsuki. Terushige Matsuki was a master carpenter who built many buildings employing the Fujimura style of architecture, which combines Western and Japanese styles. He was involved in the construction of many school buildings. This building was also built in the Fujimura style. When Yamanashi Tanaka Bank was established in 1920, it opened in this building. Behind the building, a brick storehouse for important documents, one cocoon storehouse, and two rice storehouses were also built. During World War II, these buildings were remodeled into a residence, and the Kitashirakawanomiya family (the family of one of the Imperial princes) temporarily evacuated to the residence for safety. Currently, the building is open to the general public as a museum. The main building and brick storehouse are designated National Tangible Cultural Properties. The counter used during the time when the building was a post office, and chairs and desks used in the bank still remain as they were. In addition, there are many items with unique designs that combine Japanese and Western styles. These include traditional Japanese ridge-end roof tiles with Western pull-up windows, and Western-style iron fences with Japanese characters of “田 (ta)“ and “中 (naka).”