Continuous ambulatory peritoneal dialysis (PD) is one of the treatment methods used for end-stage renal failure. When mechanical complications occur with this treatment method, methods such as tomographic peritoneography, abdominal scintigraphy, and magnetic resonance peritoneography are used to uncover the problem. Here, we report the detection by tomographic peritoneography of a subcutaneous dialysate leak in a patient undergoing PD. The PD catheter was subsequently removed, and a new catheter was inserted. The patient then restarted continuous ambulatory PD without any problem.