Vibration actuator, lens barrel, and camera

Disclosed is a vibration actuator which can be arranged in a limited space, and which has excellent drive performance. Also disclosed are a lens barrel and a camera, which are provided therewith. Specifically disclosed is a vibration actuator (10) which comprises: a piezoelectric body (13) which has a first surface (13a), and which is excited by an electrical signal; a vibration body (12) which is joined to the first surface (13a), and which has a second surface (12d) on which vibration waves are generated by the excitation; and a moving body (15) which is brought into pressure contact with the second surface (12d), and which moves relatively to the vibration body (12), wherein the thickness of the piezoelectric body (13) is different in the direction of the relative movement of the moving body (15).