To our knowledge, there is no case report of the synchronous resection of colon and ureteral carcinomas by laparoscopy, because of the rareness of this combination and the technical difficulties involved. We report a case of simultaneous descending colon and left ureteral carcinomas, both of which were judged to be relatively early stage carcinoma, which we resected successfully laparoscopically. The patient, a 65-year-old man, recovered uneventfully and was discharged on postoperative day 8. For simultaneous abdominal primary malignancies, laparoscopic surgery should be considered proactively if the procedure is technically feasible and judged to be curative.