The subjects of this study were 5-year-old and 1-month-old boy diagnosed with ADHD in a pediatric hospital. Child-centered play therapy was performed for a total of 38 sessions once a week for 40 minutes for ADHD children. While he was pushing the therapist in his first meeting with the therapist, he was shouting and opening the door to the play room. Unlike children who has other problems from the beginning of the counseling session, ADHD children showed everyday difficulties in the play process. The analysis method was divided into the divisive place of paranoid-schizoid position of a partial object and the depressive position of the whole object. In the paranoid-schizoid position of a partial object the target child gradually overcame the paranoid-schizoid position by repeatedly projecting the shape of projective identification and split during several sessions. In the depressive position of the whole object, the target child showed a sufficiently good internal object in relation with the therapist, establishing the whole internal object at the core of the self. Therefore, it is meaningful that this study provided basic data to analyze the process of child-centered play therapy of ADHD children from the viewpoint of Melanie Klein as the stage of change of partial object and whole object.