ESD protection device and method for producing the same

A method for producing an electro-static discharge protection device, the method comprising:

• a discharge electrode formation step of forming a pair of discharge electrodes facing each other on at least one of a surface of a first insulating ceramic layer and a surface of a second insulating ceramic layer;
• an auxiliary discharge electrode material-providing step of allowing an auxiliary discharge electrode material to adhere between facing portions of the discharge electrodes;
• a laminating step of laminating the first insulating ceramic layer and the second insulating ceramic layer in a state in which the surface of the first insulating ceramic layer and the surface of the second insulating ceramic layer face each other to form a laminate;
• a dividing step of dividing the laminate into individual bases;
• an outer electrode formation step of forming outer electrodes that are electrically connected to the discharge electrodes on surfaces of a base obtained in the dividing step;
• and
• a firing step of firing the base including the outer electrodes thereon to form a cavity between the first insulating ceramic layer and the second insulating ceramic layer so that an end of each of the discharge electrodes is exposed in the cavity and to disperse the auxiliary discharge electrode material in the cavity;
• wherein
• the method includes a constriction step of depressing, among outer surfaces of the base, a central portion of an outer surface substantially perpendicular to a laminating direction of the insulating ceramic layers toward an inside of the base in the laminating direction with respect to at least one of a longitudinal cross section passing through a center in a longitudinal direction of the base and a lateral cross section passing through a center in a lateral direction of the base.