A piezoelectric device (57) includes: an elastic layer (58) that forms an insulating surface region at least partially and has an amorphous structure or random orientation at least in the surface region； a piezoelectric body (63) that is provided on the elastic layer (58), has a first surface in contact with the elastic layer (58) and a second surface on an opposite side to the first surface, and is (100) preferentially oriented in an orientation region corresponding to the surface region in a plan view； a first electrode (61) provided on the second surface of the piezoelectric body (63)； and a second electrode (62) that is provided on the second surface of the piezoelectric body (63) . A gap (64) is formed between the first (61) and second electrodes (62) corresponding to the orientation region in the plan view.
