This study is a case study in which one middle-aged depressed woman overcomes depression by improving resilience. The purpose of this case study is to examine the psychological and behavioral changes in the collage process and changes in the projection picture test through collage art therapy, and provide them as basic data for the clinical field. Collage art therapy was conducted once a week for the study subjects, 60 minutes per session, and a total of 16 sessions. The subject of the collage art therapy program was decided centered on the client, and the records for each session of this study were described by analyzing verbal and nonverbal behaviors and collage works of the study subject. In addition, HTP was performed before and after collage art therapy to examine the changes in the projection picture test, and the pictures were analyzed. The results of the study are as follows. As a result of performing collage art therapy, changes in resilience appeared in the introduction, work process, and collage works in each session. The subjects of this study experienced psychological recovery in the course of collage art therapy, and their self-regulation ability, interpersonal relationship ability, and positivity were improved. In addition, the results of HTP analysis showed improvement in psychological maturity and positivity. In conclusion, collage art therapy was effective in improving resilience for depressed middle-aged women.