The study was designed to examine the relationship between shyness and social behaviors such as interpersonal adjustment and peer acceptance. The subjects were 435 sixth-graders(221 boys and 214 girls) and their mothers and teachers. They completed questionnaires to rate the behavioral characteristics of the children. The main results showed that 1) shyness, interpersonal adjustment, and peer acceptance varied little as a function of sex and birth order of children, and 2) shyness was related negatively both to interpersonal adjustment and to peer acceptance.