An ESD protection device includes a ceramic base material including a glass component, a first opposed electrode on one side of the ceramic base material and a second opposed electrode on the other side of the ceramic base material, which are arranged so as to include ends that are opposed to each other on the surface of the ceramic base material, and a discharge auxiliary electrode disposed between the first and second opposed electrodes, which is connected to each of the first and second opposed electrodes, and arranged so as to provide a bridge from the first opposed electrode to the second opposed electrode, and a sealing layer to prevent the ingress of the glass component from the ceramic base material into the discharge auxiliary electrode is provided between the discharge auxiliary electrode and the ceramic base material.