Abstract
This paper aimes to classify the development process of group formation in leisure life and to clear the structure of demand for assembly facilities from the viewpoint of connection with above-mentioned development process. The conclusions are as follow ; 1) The development process of group formation at public assembly facilities which is open to the whole city relatively shows 'core shift pattern'. 2) The development process of group formation at private assembly facilities which is open to the whole city relatively shows 'core keep pattern'. 3) The one who takes parts in private group formation shows different pattern of demand from the one who takes parts in public group formation especialy in aspect of facility management, facility scale, and 'facility speciality or collectivility'.
