LAMINATED PIEZOELECTRIC ELEMENT, INJECTION DEVICE PROVIDED WITH SAME, AND FUEL INJECTION SYSTEM

摘要

[Problem] To provide a laminated piezoelectric element wherein stress applied to an interface between a coating layer and a laminated body is reduced, an injection device that is provided with the laminated piezoelectric element, and a fuel injection system. [Solution] A laminated piezoelectric element 1 of the present invention is provided with: a laminated body 10 wherein piezoelectric layers 11 and internal electrode layers 12 are alternately laminated; and a coating layer 16 that is provided such that the coating layer surrounds the side surface of the laminated body 10. The coating layer 16 has a double layer structure wherein the boundary is annular when viewed in a cross section perpendicular to the lamination direction of the laminated body 10.