The characteristics of the behavior of injured in Nishinomiya City at the Hanshin-Awaji Earthquake Disaster are analyzed to propose an estimation method of the number of the injured to medicalinstitutions. This estimation method is composed of the logistic curve with some parameters, and correlated with the true value. Through a case study, it becomes clear that the location of medical institutions would bring the over-concentration of the injured and that the traffic jams by broken bridges would not be main factors. Transport plan of the injured should be handled explicitly into local disaster prevention plan.