The incidence of the perforated ulcer was 1.5% out of the total mumber of 2.935 cases of the operated gastr ic and duodenal ulcers dur ing the same period. Fourty cases out of 44 perforated ulcers were t rea ted with the gastrectomy, wholly in Bil lroth I. One death was resul ted and the operative morta l i ty rate was 2.5%. In a gereral tendency, the perforated gastr ic ulcer was seen more often in older ages, while the duodenal ulcer in younger ages. The later the surgical t rea tment , the worse the prognosis.