Patent ID: 7564176

Claim:
A laminated piezoelectric element comprising: a plurality of piezoelectric layers each comprising a composite oxide as a main constituent thereof; and a plurality of internal electrode layers formed between the piezoelectric layers and comprising Ag; wherein: the piezoelectric layers are each comprised of a sintered body comprising: the composite oxide, as a main constituent thereof, represented by (Pb a-b M b ) [(Zn 1/3 Nb 2/3 ) x Ti y Zr z ]O 3 with the proviso that 0.96≦a≦1.03, 0≦b≦0.1, 0.05≦x≦0.15, 0.25≦y≦0.5, 0.35≦z≦0.6, x+y+z=1, and M represents at least one selected from Sr, Ca and Ba; Ag in a content of 1.0% by weight or less, not inclusive of 0, in terms of Ag 2 O in relation to the main constituent; and Ta in a content of 0.7% by weight or less, not inclusive of 0, in terms of Ta 2 O 5 in relation to the main constituent.