A 2-year-old female was hospitalized because of generalized peritonitis with pneumoperitoneum. A laparotomy disclosed a perforated ulcer of the cecum. A resection of the perforated portion of the cecum was then performed. Histopathologic examinations confirmed that the ulcer was non-specific in nature. No recurrence was observed four years since the limited operation. Pneumoperitoneum caused by perforation of non-specific cecal ulcer in a child has, to our limited knowledge, not yet been previously reported.