Abstract
The purpose of this study is to clear the mechanism on process of spreading of the styles and materials concerning newly built detached houses in Japan. As a result, we cleared the followings, 1) The speed of spreading is different among styles and materials. 2) The modern styles and materials decline by the predominance of the other modern styles and materials. 3) The traditional styles and materials are declining but except for symbolic styles. 4) The area of spreading of the styles and materials which is influenced by the climate doesn't change.