To provide a nerve stimulation device capable of stimulating a vagus nerve stably while reducing the risk of interrupting a treatment by nerve stimulation due to disconnection or the like. Adopted is a nerve stimulation device including a first electrode and a second electrode disposed in different positions on the vagus nerve, a pulse generating part connected to each of these electrodes, for outputting an electric pulse for stimulating the vagus nerve, and a setting part for switching the electrode to which the electric pulse from the pulse generating part is transmitted.