Abstract
This article, deals with childrens' learning of the reason why the shape of the moon changes. I establish that the Japanese National curriculum doesn't cover the reason why the shape of the moon changes. The learning content is treated in the curriculum for fifth graders or higher over of elementary school. Then I investigated children's recognition of space. The result shows that it is difficult for children to foresee that drawn figures of a ball changes by shifting viewpoints. That, it is assumed that the learning of the change of the moon shape should be treated in the curriculum for third graders of junior high school.
