The present study analyzed the stress of 2599 male juvenile delinquents (aged 14-19) in juvenile classification homes all over Japan. It had three concrete purposes: 1) to investigate the relationships between daily stress responses and stress responses just before delinquent behavior; 2) to investigate the relationships between stress responses just before delinquent behavior and stress responses immediately after delinquent behavior; 3) to investigate stress process of juvenile delinquents. The result showed that 1) the degree of stress responses was changed by delinquent behavior, 2) the frequency of daily stressors on personal relations had relations to the life history of juvenile delinquents, 3) the degree of daily stress responses was influenced by the subjective stressors on personal relations, specifically relations with their parents, and 4) the degree of daily stress responses was also influenced by the social support of juvenile delinquents.