This thesis is a development project for a myoelectric prosthetic hand. That means a mechanical hand that is controlled and actuated by the user's own muscles on the residual limb. The thesis has led to a theoretical concept of a complete prosthesis and a non-complete physical prototype that provides proof of concept and functions. The thesis was as a means of providing the mechanical development of an alternative model of the prosthesis that is more functional and has the ability to offer the users a lower price than current models. The foundation of the project is that the development has been done on a user needs basis. This leads to customer requirements that are derived from the users themselves. The development begun with a wide research to obtain user feedback as well as technical data of different mechanical solutions. The focal point of the thesis is the mechanical aspect of the prosthetic while the electronic and sensory systems were implemented with the use of standardized components.