The relationship between feeling of inferiority and self-oriented perfectionism in adolescence was investigated. Adolescents ( N 5609) were asked to complete a questionnaire of 40-item feeling of inferiority scale and Multidimensional Self-oriented Perfectionism Scale (MSPS). Results of cluster analysis revealed four clusters of adolescents: (1) Low perfectionism, (2) High concern over mistakes, (3) High perfectionism, and (4) High personal standards. Results of analysis of variance indicated that adolescents with high concern over mistakes had significantly stronger inferiority feeling than other groups.