Attention Deficit Hyperactivity Disorder (ADHD) is one of the most common psychiatric diagnoses in childhood and adolescence. ADHD is considered symptomatic according to DSM diagnostic criteria and neurophysiological factors are prominent in its etiology. In the psychiatric approach, it is clear that the psychopathological aspect of this disorder is ignored. Psychoanalytic theory considers ADHD as a result of an underlying psychological problem, not a syndrome of its own, which may arise because of different anxieties in every child. Research indicates that there is a lack of maternal containing functions and a concern for object loss. In this study, the mental functioning of E., who was diagnosed with ADHD at the age of eight years, was examined through projective tests (Rorschach and CAT) in terms of the quality of maternal containing function. It is observed taht manic defenses are used against the anxiety of object loss and intrusion; maternal containing function is damaged and a narcissistic weakness is relevant. In this context, this study indicates that hyperactivity occurs as a manic defense against the danger of breakdown due to depressive anxiety.