This study analyzes the formation of communities and the situation of isolation in post-disaster public housing built after the Great East Japan Earthquake through three surveys conducted over a period of three and a half years. The main findings are as follows: (1) The relationships formed in temporary housing were effective in supporting the leadership of the community organization, (2) There was no significant difference in community formation between the floors, and (3) For elderly residents, using the communal space in the building helped maintain connections, but its function to form new relationships was limited.
