MULTILAYERED PIEZOELECTRIC ELEMENT AND INJECTION DEVICE AND FUEL INJECTION SYSTEM USING THE SAME

[Problem] Provided is a multi-layer piezoelectric element in which extension of a crack from an end face thereof is suppressed to improve the durability, and an injection device and a fuel injection system using the same. [Solution] A multi-layer piezoelectric element (1) includes a columnar stacked body (5) including an active portion (2a) including piezoelectric layers (21) and internal electrode layers (3a, 3b) alternately laminated, and inactive portions (2b) including piezoelectric layers (22) laminated, the inactibve portions arranged at both ends in a stacked direction of the active portion (2a); and a pair of external electrodes (4a, 4b) arranged on side faces of the columnar stacked body (5), the pair of external electrodes electrically connected to the internal electrode layers (3a, 3b) alternately. In at least one interlayer portion of the inactive portions (2b), there are metal particles (12) having a particle size smaller than that of piezoelectric ceramic particles forming the piezoelectric layers (22) of the inactive portions (2b), and the metal particles are scattered in a range including a region in which the internal electrode layers (3a, 3b) overlap each other when viewed in the stacked direction of the columnar stacked body (5).