Introduction: Laparoscopic surgery has been utilized in the fields of gastroenterology, urology and gynecology for the last decade. colorectal cancer and renal cell carcinoma are becoming more common, and syncronous cases are possible. Laparoscopic surgery for colon cancer and renal cell carcinoma are stylized operations, while the concurrent operation by laparoscopy is rare. In this report, we describe a case of simultaneous laparoscopic surgery for a left renal cell carcinoma and cecal cancer. In this operation, we created new locations for the trocars. case report: An 83-year-old man was diagnosed with cecal and left renal cell carcinomas. He was of an advanced age, therefore one-stage surgery with laparoscopy by urologists was chosen by paying attention to the position of the trocars. the total number of trocars was 7, and the total combined wound length was 12 cm. the operation time was 9 hours 20 minutes. Nevertheless, blood loss was minimal (30 ml), and the postoperative course was uneventful. He was discharged on the 12th hospital day. conclusion: We experienced concurrent cancer cases and performed the simultaneous operation safely. simultaneous