This study aims to explain the relation between the local fire prevention act and diffusion of mud-walled town houses in Nagano Prefecture. The act being put into operation in 1888 just after the great fire in Matsumoto city and lasted until 1890, referred to those of Tokyo in 1881 and Toyama in 1887, however contains its own elements. For example, it targeted only new buildings. In Matsumoto, one of the targeted cities among six, it is identified that mud-walled town houses were built after the local act in the burned district where few mud-walled houses existed before the fire.
