This study aims to develop teaching materials and instruction methods which help pupils acquiring the spatial thinking ability. Through experiment lessons, I found the followings as pupils' problems concerning the spatial thinking. 1) Pupils understand the projective view of solid. 2) Pupils have the difficulty to keep the front face of solid in one direction when they draw their figures. 3) Pupils often ignore the relative size of solids when they draw several solids in one figure. 4) Pupils often reverse the figure of solid. 5) Pupils sometimes draw the figure seen from diagonally above of solid. 6) Some pupils cannot consider two figures simultaneously in the process of making solid. 7) Pupils do not check the possibility of an alternative solid after they make one solid.
