The present study investigates the relation between social skills and indicators of school adjustment: school satisfaction, self-esteem, depression, and aggression. A total of 284 students (boys = 145, girls = 139) participated in a questionnaire survey. The results of correlation analysis and Zou's test revealed that (a) hairyo skills, which consist of compassion for others and maintaining relationships with peers, were negatively correlated with aggression; and (b) kakawari skills, which consist of assertion and developing relationships with peers, were positively correlated with school satisfaction and self-esteem, and negatively correlated with depression. These outcomes show significant result indicating that contents of social skills should be considered when trying to understand school adjustment problems and conducting social skills training.