This research was to verify the effect of collage group art therapy program on the development of middle aged women’s self esteem and stress coping ability. The subjects were 10 middle aged women and 5 people in each were randomly assigned to experimental group and control group. The research period was from October 28 to December 30, 2019. Each program was 120 minutes and was implemented once a week for 10 times in total. The study tools used a self-esteem scale and a stress coping ability scale. For data analysis, Wilcoxon Signed Rank Test was used as a nonparametric test and its phased changes were recorded. The result of this research was the following. Firstly, collage group art therapy had a significant difference in middle aged women’s self esteem. Secondly, collage group art therapy had a significant difference in middle aged women’s general stress coping ability. Thirdly, in the step-by-step changes in collage group art therapy, middle-aged women increased self-respect and stress coping ability through positive self-image and visual representation, and developed positive aspects of life through interaction with group members. Therefore, we could able to verify that there was a positive effect of collage group art therapy on the development of middle aged women’s self esteem and stress coping ability. It also had a significance in terms of base data as it could be used in counseling and psychotherapy.