We described a 15-year-old boy who underwent the catheter ablation for the nodoventricular tachycardia that had difficulty in differentiation from atrioventricular nodal reentrant tachycardia with upper common pathway. The slow pathway ablation revealed an anterograde conduction of nodoventricular fiber. We successfully performed the catheter ablation targeting for the right ventricular insertion site of the nodoventricular fiber.