A case of distant metastasis to mesh-plug prosthesis in gastrointestinal cancer is presented herein. An 88-year-old man had received mesh-plug repair with high ligation for a recurrence of a right inguinal hernia. Six months later, advanced gastric cancer and advanced transverse colon cancer were detected, and therefore a distal gastrectomy and partial colectomy were performed. Two weeks after the operation, the patient complained of right groin tenderness, and the mesh-plug prosthesis was removed to control any infection. A histopathological investigation demonstrated adenocarcinoma in the plug prosthesis. The patient died of carcinomatosis peritonei 45 days after the last operation.