This paper reports the results of experiments in which two astronauts evaluate the volume and impression of the laboratory room and the storage room in the Japanese Experiment Module "Kibo" of the International Space Station under microgravity, and 29 students evaluate the volume and impression of the two mockup rooms on the ground. The results are as follows. 1) The volume of the storage room of ISS was overestimated, or the volume of the laboratory room was underestimated. On the other hand, both the volume of the two mockup rooms were evaluated almost exactly. 2) Both the storage room and the laboratory room of ISS were evaluated as being "spacious", "not oppressive", "calming" and "comfortable". On the other hand, the mockup of the storage room was evaluated as being "not spacious", "oppressive" and "calming", and that of the laboratory room was evaluated as being "spacious", "not oppressive" and "not comfortable".