Patent ID: 7170217

Claim:
A stack-type piezoelectric device comprising: an active layer consisting of an alternate stack of first piezoelectric layers in each of which a first internal electrode is formed, and second piezoelectric layers in each of which a second internal electrode is formed, the active layer being displaced in a stack direction when a voltage is applied between the first internal electrode and the second internal electrode; and a third piezoelectric layer in which a first terminal electrode for applying a voltage to the first internal electrode, and a second terminal electrode for applying a voltage to the second internal electrode are formed, wherein an inactive layer is placed between the active layer and the third piezoelectric layer, and wherein the inactive layer comprises a stack of a plurality of fourth piezoelectric layers in each of which a first through hole for electrical connection between the first internal electrode and the first terminal electrode, and a second through hole for electrical connection between the second internal electrode and the second terminal electrode are formed.