In this study, multigenerational symbiotic houses were classified into one-building, settlement, and town types, focusing on the attributes of residents, common space, and presence or absence of support. The actual condition was grasped through the interview, and the following were defined, classified, and analyzed as a factor that brings about the symbiosis: Commonality, openness, mixedness, diversity. The density of communities was closely related to mutual aid and the formation of community bases. It is important to understand the characteristics of the three forms and the factors that lead to symbiosis and make a choice according to the purpose.
