In a piezoelectric device, a first electrode, a first piezoelectric film, a second piezoelectric film, and a second electrode are formed in this order on a first electrode formed above a surface of the substrate, and an intermediate electrode is arranged between the first and second piezoelectric films. Each of the first and second piezoelectric films has a thickness of 10 micrometers or smaller, and has a first surface facing toward the substrate and a second surface opposite to the first surface. At least one of the first and second surfaces has an arithmetic average surface roughness (Ra) of 0.5 micrometers or smaller.