A piezoelectric member of single crystal or uniaxial crystal and the piezoelectric member has a perovskite type oxide of a general formula ABO.sub.3 with a main component of the A being Pb and a main component of the B containing at least three kinds of elements selected from the group consisting of Mg, Zn, Sc, In, Yb, Ni, Nb, Ti, and Ta, and a film thickness of the piezoelectric member is not less than 1 .mu.m and not more than 10 .mu.m and the piezoelectric member fulfills a predetermined conditions on a relative dielectric constant or a Curie temperature.