The Kotani clan exists from the Kamakura period (1185-1333). The family has the classical Yamatomune or Takahetsukuri*1 Main House with a large entrance constructed in the Edo period. The Dozo (rice storage), second storage, paddy storage and so on stand side by side by the main gate. The main gate is the ‘Bajo-mon’*2 which was relocated the ‘Karamete-mon’*3 bestowed from Hakata Domain at the time of Haihan-chiken*4. This is one of the represented village headman architectures in the Senshu region. It is open to the public since it became an incorporated foundation in 1991, a registered museum in 1994. The ancestral historic, racial, art materials of the Kotani family including archaeological and historical resources centered sueki (unglazed ware) excavated from Suemura ruins of kilns are displayed. *1 Yamatomune or Takahetsukuri ; a combination of a thatched and tiled roof on a gable *2 Bajo-mon: Gate designed to height able to pass by while riding a horse *3 Karamete-mon: one of the castle gates located at the karameteguchi (back gateway), as opposed to Ote-mon (main gate) being at the front of the castle. *4 Haihan-chiken ; the feudal domain system was abolished and the prefectural system was introduced (1871)