Carcinoid tumor arising from the colon is a relatively rare entity. A case of perforated sigmoid colon carcinoid is reported.A 67-year-old female was diagnosed as having peritonitis due to perforation of a sigmoid colon cancer, and underwent sigmoidectomy. The tumor was about 10 cm in diameter and about 5 mm size of perforation was noticed in it. Diffusely infiltrating carcinoid tumor was recognized microscopically. The patient developed multiple liver metastasis shortly after the operation. Inspite of frequent hepatic arterial infusion of chemotherapy, she dided 10 months after the operation. We have experienced twenty-nine cases of carcinoid tumor arising from the digestive tract in as relatively low as a recent one decade, but only two cases from the colon. The rate is 6.9%. The case of perforated colon carcinoid is quite rare and we found only one case in the literature. The clinical course and prognosis in this case were discussed.