Patent ID: 8672456

Claim:
A piezoelectric film which has a columnar crystal structure constituted of a plurality of columnar crystals, and contains a perovskite oxide represented by the following formula (P) as a main component: Pb a A b [(Zr c Ti 1-c ) 1-d B d ]O e , (P) wherein Pb and A are A-site elements, and A is at least one element selected from a group consisting of Bi, La, Cc, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ca, Sr and Ba; Zr, Ti and B are B-site elements, and B is at least one element selected from a group consisting of Nb, Ta and Sb; a is an amount of lead, b is an amount of the element A, c is a Zr/Ti ratio, d is an amount of the element B, e is an amount of oxygen; values of a, b and d satisfy a<1, a+b≧1, and 0<d<b; e=3; and the value of d in the formula (P) satisfies 0.1<d<0.2.