This paper is made an analysis as to how much influence is affected to the residential satisfaction by information search and expectancy conformity/nonconformity. The above mentioned analysis results in that information search and expectancy conformity/nonconformity appear to be influential factors to explain the residential satisfaction after purchase. Especially, the more the expectancy of pre-purchase and the performance of post-purchase equal, the higher the residential satisfaction. In addition, even if a slight difference emerges in the domain of the residential satisfaction, it appears that the more information search is conducted, the higher the residential satisfaction and information from salesman or reference group affect on the expectancy conformity/nonconformity. When purchasing housing, to search more information shows that the expectancy of pre-purchase gets close to the performance of the post-purchase, that is to say, to the positive residential satisfaction.