NOVELTY - The actuator comprises a piezoactive element (3) for generating vibrations, and an oblong metal structure (5) having a major axis (7) and a small axis (9) extending perpendicularly relative to the other and encircling the piezoactive element that is arranged along the major axis of the metal structure, where the metal structure stresses the piezoactive element and amplifies the vibrations produced by the piezoactive element along the small axis of the metal structure. The metal structure is obtained by bending a precut metal sheet.    USE - The piezoelectric actuator is useful producing haptic feedback on touch interfaces such as resistive touch sensors and capacitive or optical sensors coupled to a display screen, and in automotive industry.    ADVANTAGE - The actuator can be manufactured with less material costs and long service life.    DETAILED DESCRIPTION - The actuator comprises a piezoactive element (3) for generating vibrations, and an oblong metal structure (5) having a major axis (7) and a small axis (9) extending perpendicularly relative to the other and encircling the piezoactive element that is arranged along the major axis of the metal structure, where the metal structure stresses the piezoactive element and amplifies the vibrations produced by the piezoactive element along the small axis of the metal structure. The metal structure is obtained by bending a precut metal sheet. Ends (11a, 11b) of the metal sheet are secured by electric welding. The elongate metal structure has a rhombic shape or elliptical shape. The metal structure is made of sheet metal. The metal structure comprises two flat surfaces parallel to each other and to the piezoactive element and centrally with respect to the major axis of the metal structure. The flat surfaces are bordered by stampings for stiffening the metal structure. A plastic molding is formed at the flat surfaces to allow attachment of the actuator. Another plastic molding is formed at the ends of the metal structure at the major axis to allow the attachment of the piezoactive element. A power supply cable is arranged at the piezoactive element. The former plastic molding comprises a cable outlet for receiving the supply cable. The cable outlet includes a baffle for retaining the supply cable. The plastic molding comprises a connector, which is connected to the power cable of the piezoactive element. The piezoactive element is a piezoelectric ceramic. An INDEPENDENT CLAIM is included for a method for manufacturing a piezoelectric actuator.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic side perspective view of an actuator.    Piezoactive element (3)    Metal structure (5)    Major axis (7)    Small axis (9)    Ends of the metal sheet. (11a, 11b)