The purpose of this study is to clarify the effect that the shape and the position of partition have on the subject's place and perception of room volume. The various shape and position of partition panel is presented randomly. In experiment 1, subject behavior is recorded by observation. In experiment 2, The Method of Magnitude Estimation is used; subjects are requested to compare the volumes of different types of room. This paper is reported about experiment 1. The results are summarized as below; 1. The subjects are prone to choose the neighborhood of partition, wall and reentrant angle as the place. Consequently, it tries to get a protection of the back, feeling of calmness. 2. The extent of the front space in the room and the relative position (especially the visual relative position) with the partner induces the tendency to decide the place to stay.
