Totally 41 patients consulted Department of Psychiatry, Kawasaki Medical School Hospital since 1974,with a chief complaint of impotence. These cases were classified according to etiological factors into honeymoon impotence (18 cases), neurosis (13 cases), aging (2 cases), mental deterioration (3 cases), and psychosis (5 cases). To 27 patients of honeymoon impotence and neurosis were given Yatabe-Guilford Personality Inventory (YG test) and to 11 of them were given MMPI. The results were compared with those of 75 normal males. According to YG test of these patients psychogenic impotence, the incidence of the average type and eccentric type was significantly higher, and that of the director type signiflcantly lower than the normal control group. According to MMPI, these impotent males indicated higher scores in all scales except for Scale 9 (Ma) than the normal control group. There were 7 patients who showed high scores more than 70. These high-score patients had more unfavorable prognosis than other patients with lower scores. Thus, it was found that the psychogenic impotent males were characterized with emotional instability.