The purpose of this study is to find the factors of elementary school children\'s stress and to compare of stress factors of elementary school children due to participation of physical activities after class. The subjects were 1,016 elementary children who live in Gwangju city and Chonnam province. The scale was used stress scale for elementary children which was made by this researcher. The results were as follows;
1. In analysis contents of elementary school children\'s stress, First factor was stress related their play, the Second factor was stress related their learning, the third factor was stress related their friends, and final factor was stress related their physical activities.
2. In analysis between sex and grade, boys shows higher stress related play, friends than those of girls, but girls shows higher stress related learning than that of boys. The grade had not effect to their stress.
3. The group more like physical activities shows lower stress related their friends than lower of that, and the group who recognized their ability of physical activities as high shows lower stress related physical activities than that as lower.
4. In analysis compare between group which participated in physical activities after class and group which had participated in those, participation group shows lower stress related their play and physical activities than the group didn\'t have participated in those. The factors of frequency and periods of physical activities participation influenced elementary school children\'s stress.
※ Key words : stress factor, elementary school children, physical activity, after class