We report a case of post-traumatic delayed stricture of the small bowel. An 11-year-old girl wearing a 2-point seat belt while riding as a passenger in a car was injured. Her demonstrable injuries were an L3 Chance fracture and contused seat belt scar in the lower abdomen. Symptoms of bowel obstruction began 9 days after the injury but then improved. On the 21st day, symptoms of bowel obstruction worsened rapidly, necessitating surgery. Four annular stricture lesions were revealed. Three were resected and one was treated conservatively. Mesenteric injury was slight. Histological findings were Ul-IV and no ischemic change. The time elapsed from the injury to the appearance of these symptoms was approximately 12 days. Laparotomy is important in considering resection. The main causes of this disease are circulatory disorders and inflammatory adhesions, but in our case the source was an organic change in the curative course of small bowel injury.