In a stack-type piezoelectric device, a separator made of a material capable of preventing solder leaching is buried in a terminal electrode so as to block the whole of an aperture of a through hole. For this reason, it is feasible to securely prevent an electroconductive member in the through hole from dissolving into a molten solder, during connection of a lead wire to an outside layer of the terminal electrode by the solder, and to securely prevent breakage of electrical connection in the through hole.