Vibration actuator, lens barrel and camera

A vibration actuator comprising:

• an electromechanical conversion element which is excited by a driving signal;
• an elastic body to which the electromechanical conversion element is jointed, and on a driving face of which, vibration waves are generated by the excitation;
• and
• a relative moving element which is pressure-contacted with the driving face of the elastic body, and which is driven by the vibration waves, and wherein:
• a joining face of the electromechanical conversion element which is joined to the elastic body has an electrode portion where an electrode is formed, and a joining strength improving portion which improves the joining strength between the elastic body and the electromechanical conversion element;
• and
• the electrode portion is formed on at least one of two edge portions of the joining face, through the edge portions, an imaginary straight line which passes the joining strength improving portion and which is orthogonal to a relative moving direction of the elastic body and the relative moving element passes.