Nihon University and Nippon Medical School be doing real world in-depth accident study. All injury number has been present 770 exist, thoracic injury the number of 197, 28% rate. Also abdominal injury the number of 107, 14% rate. In this study to analyzed the relationship between the thoracic/abdominal injury of belted occupant by in-depth accident study data. In addition, revealed a detailed data of Equivalent barrier speed(EBS), injury source, and MS. The results show that rib fracture in the thoracic, mesentery in the abdomen has many occurred. Thoracic injuries occupant behavior and deformation of the seat had a significant impact. Correlation occurs in age difference abdomen from thoracic.