Piezoelectric device, piezoelectric device manufacturing method, and liquid discharge apparatus

A piezoelectric device, comprising the following on a substrate in the order listed below:

• a lower electrode, a piezoelectric film which contains a Pb containing perovskite oxide represented by a general expression (P) below, and an upper electrode, wherein:
• the piezoelectric film has a layer of pyrochlore oxide on the surface facing the lower electrode;
• and
• the average layer thickness of the pyrochlore oxide layer is not greater than 20 nm, and
• AaBbO3 (P)
• where,
• A:
• at least one type of A-site element containing Pb as a major component,
• B:
• at least one type of B-site element selected from the group consisting of Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Sc, Co, Cu, In, Sn, Ga, Zn, Cd, Fe, and Ni, and
• O:
• an oxygen element, and
• a=1.0 and b=1.0 or the values of a and b may deviate from 1.0 within a range in which a perovskite structure can be formed.