Atrial fibrillation (AF) is mainly initiated by arrhythmogenic triggers originating from the pulmonary veins, and ganglion plexus often plays a crucial role in the induction and maintenance of AF. In this report, we describe a case of successful cryoballoon ablation of focal atrial tachycardia originating from the left inferior pulmonary, in which vagal response was observed, and discuss its tachycardia mechanism.