An ESD protection device includes an insulating substrate, first and second discharge electrodes in contact with the insulating substrate, the first and second discharge electrodes separated from each other and opposing each other, first and second outer electrodes on an outside surface of the insulating substrate, the first outer electrode being electrically connected to the first discharge electrode and the second outer electrode being electrically connected to the second discharge electrode, and a discharge auxiliary electrode spanning the first discharge electrode and the second discharge electrode in a region where the discharge electrodes oppose each other. The discharge auxiliary electrode includes semiconductor particles and metal particles. An average particle diameter of the metal particles is about 0.3 μm to about 1.5 μm. A density of the metal particles is greater than or equal to about 20 particles/50 μm2 and the semiconductor particles include an oxygen-containing layer on surfaces of the semiconductor particles.