The theme of this thesis is the design of prosthetic human arm, more precisely human fist. Prosthetic arm is considered to be a device which will replace human limb, i.e. human arm. The aim of this thesis is to design the mechanism and human fist with the ability to accept and manipulate with objects. The ultimate goal is design of prosthetic arm withlow price that can compete with advanced prostheses of the same type and with the purpose of improving the quality of human life, which is reduced by amputation. Designing and modeling was carried out in a commercial software package Catia P3 V5R21 SP3, by company Dassault Systèmes (DS). Second chapter describes the course of developing implants and their changing throughout history. In the third chapter research on prosthetic arm market was conducted. and conclusion on research was adopted. In the fourth chapter it is briefly explained the principle and the way of functioning of the human fist. Fifth chapter describes the design of a new product. In the sixth chapter it is presented the development and selection of the concept of the prosthetic arm. In the seventh chapter technology and materials for production of the prosthesis are briefly described. Eighth chapterextensively describes the process of modeling prosthetic fist and other parts of the mechanical prostheses and their assembly. It is shown the final form of the prosthetic arm and the costs of making the prostheses by FDM and Polyjet technology. In the final chapter the debate was conducted and the conclusion was made on the production and further development of this type of prosthesis.