This paper aims to clarify the process of post-relocational adaptation of elderly relocatees who move to nursing home. In this study the notion of environmental personalization was introduced, and a role of private room of whole dwelling institution in adaptation process was discussed. Methods used were mapping and counting of private furniture and possessions, behavior observation and deep interview of the residents about meaning of the possessions. The survey was repeated five times in order to follow longitudinal change. Findings are as follows. 1) Number of possessions placed in resident's private room has been increased. 2) Four aspects of process of personalization in private room by means of bringing possessions in were observed, those were spatial aspect, personal aspect, social aspect, and temporal aspect. 3) Each resident could confirm identity by sense of subjectivity and relationship in private room. 4) Private room played very important role in diverse adaptation processes that reflect diverse relation between each resident and environment around him/her.
