The purpose of present study was to investigate developmental process of a dodgeball throwing motion in elementary school children. The subjects were 239 elementary school children (114 boys and 125 girls) ranging grade from first to sixth. They were videotaped during a dodgeball throwing motions. One teacher specializing in health and physical education, five third- and fourth-year students of the Department of Education, and four graduate students observed the childrenʼs throwing motions and classified them. In the classification, the observers were not informed of the results (distances) of dodgeball throws. The results of analysis revealed that eight typical throwing patterns were observed in elementary school children, and that the throwing pattern developed along with grade from the immature pattern to more mature patterns progressively. Both boys and girls a dodgeball throwing distance developed with grade. In terms of their throwing motions, girls were inferior to boys ; a larger number of girls : stepped forward with their right (left) leg when they threw the ball using the right (left) hand ; did not take a step or twist the trunk at the moment of throwing the ball；threw the ball underhanded. There were sex differences in both the distance of throws and throwing motion.
