This study makes clear the effects of floor square and ceiling height on the sense of volume and impression of interior-space. Subjects experienced the experimental space (wider floor square and lower ceiling height), and experienced the compared space (the same volume of the experimental space, smaller floor square and higher ceiling height), and answered the sense of volume and which space was felt yuttari^*. The results were summarized as follows: 1) The volume of the space of high ceiling height was felt bigger than that of the space of wide square. 2) The results of the feeling of yuttari showed three tendencies. A) The feeling of yuttari was not felt in the space of lower ceiling height (under 2100mm). B) If the difference in floor square of two spaces was 30% or smaller, the feeling of yuttari was felt in the space of bigger volume. C) If the difference in floor square is bigger, the feeling of yuttari was felt in the space of wider floor square. *The Japanese word "yuttari" includes loose, spacious and feeling of easy.