The aim of this study is to find out gathering formation and interaction in public spaces within houses, and also to reconsider of meaning of public spaces in a today's Japanese home. Basic data were collected from a plan which shows a scene of daily living situation (positions, postures and activities of family members or guests). Plans were drawn by students (subjects) themselves based on their own homes. Area, the number of room and equipment of Japanese house have raised the level quantitatively. But it must be recognized to improve the settings so as to afford diverse people's interactions. In other words, public places in a house haven't matured as a unit of living in a city. In this study we intended to clarify in these questions. 133 subjects drew plans (scale 1:100) of their houses and plans (scale 1:50) of five kinds of behavior settings. 665 sheets of behavior settings pattern were analyzed. The results of analysis are as follows. As for “postures of gathering”, formations in which sitting, seating and lying postures exist simultaneously were observed and the inevitable reasons for it were pointed out. As for “gathering formations and interactions”, issues of multi-focus setting and meaning of unified formations in which each participant is able to have loose interaction were clarified. As for “relation between size and shape of gathering”, two kinds of circles (diameter 1.5m and 3m) and different meaning of each circle were found. In the end, these results were compared with behavior settings of Chinese homes. And it was concluded that the difference itself has a cue to reconsideration of Japanese behavior settings in public spaces of a house which have apparent diversity but lack living norms.