The purpose of this study is to clarify the effect that group art therapy affects creativity and study interest for children in Elementary School. The subjects were selected as 129 children in 3 classrooms (S Elementary School, the 4th grade) in C city, then first with the test about creativity and study interest the treatment group was randomly divided into 2 groups such as experiment group (4 children) and control group (4 children), and homogeneity was verified. The group art therapy program made by this researcher was performed through 20 times of experiments for 10 weeks (2 days a week) in the proprietary art school run by the researcher, and the program was processed through prior test, experiment treatment, posterior test. The treatment methods of the materials used in this study were such as the following. First, posterior test about creativity and study interest between groups for those mean and standard deviation was assessed by t-test. Second, qualitative analysis which analyzes the activity of group art therapy and describes the changes was performed in each experiment. This study suggests the following conclusion. First, group art therapy appeared to improve creativity for children. Second, group art therapy appeared to improve study interest for children. Third, group art therapy appeared to positively affect the changes of creativity and study interest in the activity process of each experiment. Therefore, group art therapy shows the effect on improving creativity and study interest for children.