The purpose of this paper is to find emotional stability of communal relation that exists in out door space in densely built-up area. In this study, we define "Trust to neighbors" as the representative symptom of the emotional stability, and attempt to clarify the relation between the trust and daily information that the resident holds about his neighbors. The results of questionnaire survey revealed that the more the resident gets the daily information of neighbors, the higher his trust to neighbors is. And the analysis through hearing and field survey proved that the daily information are based on not a condition (ex. opened windows) of houses, but a typical condition (ex. passing through around buildings) of out door space.
