Obesity is not classed in general psychiatry disease. But, psychoneurotic factor has been known to be a risk factor of obesity. In order to evaluate and understand the psychoneurotic state on obese patient, this study used Minnesota Multiphasic Personality Inventory(MMPI). Total patients were classified into 3 or 5 clusters. MMPI scores were compared according to education, BMI and Sasang Constitution. Multiple regression analysis were used for psychological factor on obese patients by age, height, weight, education, percent body fat, fat distribution, BMI. Based on this study, it was no significantly difference by education level, BMI, sasang(四象) constitution except L profile according to BMI. These result is different from our general recognition of the psychoneurotic state on obese patient. Therefore, the bigger sample study is needed.