Prosthesis for joint shoulder reconstruction comprising a joint head shaped to provide a spherical type coupling with a concave joint element of a glenoid component. The joint head includes a metallic core and a joint cap made of a plastic material provided with a cavity insertable on an insertion element of the core along a longitudinal direction. The insertion element and the cavity are configured to define shape-coupling means operating by elastic deformation such as to secure the joint cap to the core along the longitudinal direction. A plurality of penetration elements are arranged between a plate of the core and a coupling surface of the joint cap to define an anti-rotation mechanism of the joint cap on the core.