Improvement of urban infrastructure and advanced land-use can be accomplished by reorganization of urban area through urban renewal, land adjustment, and so on. However, it can also bring about a serious influence on conventional lifestyle and living environment. In order to see how those developments affect the change of living environment, this study investigates and analyzes the actual condition of reestablishing living environment, focusing on the elderly who are vulnerable to the environmental change in the redeveloped residential area. The target area is the southern part of Ikuno in Osaka, a redeveloped area which has been congested and composed of wooden houses. The government of Osaka has performed redevelopment projects in this area and this area is seen as a model of development. In particular, rental apartment complex has been constructed there for accommodating residents who move out from the existing houses. It is because of the infrastructure maintenance, such as the construction of urban planning roads, or the reconstruction of the congested area composed of wooden houses. Based on the interviews conducted with residents over sixty years old (16 persons), who were living in the rental apartment complex (83 households live as of May, 2003.), this study investigated and analyzed the actual condition of environmental transition in terms of outdoor activities and relationship between neighbors. At first, investigation into the changes of outdoor activities that happened after moving in the newly constructed apartment complex is performed, separating outdoor spaces close to dwelling units from the neighborhood. The following aspects have been studied for outdoor spaces close to dwelling units: 1. the increase or decrease of the number of outdoor activities such as chatting, caring for plants, cleaning, and meeting of neighbors created by those outdoor activities; 2. the change of places where residents set flowerpots, garbage cans, clothes-drying platform, and bicycles before and after moving, and 3. whether they open the front door or not during their presence in the house and the reasons for the change. Next, for the daily going-out activities in the neighborhood, questions about five types of places have been asked: 1. place which they visit often, 2. place where they talk with neighbors, 3. place for spending time, 4. place where they go for their health, and 5. place which they can stop in with a light heart. In addition, for the change of relationship between neighbors, the degree of intimacy, its distribution, the spatial range that can be recognized as neighborhood, and social activities like the residents meeting have been investigated. This study shows the following results:1. After they moved in the newly constructed apartment complex, the opportunities to communicate with neighbors at outdoor spaces close to dwelling units dramatically decreased, because outdoor activities such as caring for plants, cleaning and so on decreased and most activities took place indoors. 2. The places used by the residents in the neighborhood before moving are the important elements to keep their lifestyles and customs even after moving; 3. The formation of a neighborhood after moving depends on the location of households of the neighborhood previously formed and the common activities of apartment residents like the monthly meeting; 4. As mentioned above, when making an entire plan for redeveloping of congested area composed of wooden houses, not only the reconstruction of the elderly‚ living environments but also the following factors have to be taken into account: 1. investigation of the important life resources such as facilities, place and lifestyle in the area, maintenance and succession of them, 2. house design considering outdoor activities to form a connection between outdoor space and common parts, and 3. desirable arrangement of dwelling units that can consider the relationships between the previous neighbors moving in and the support of common activities of apartment residents to form an intimate community.