The thesis deals with the structural design of a device used for handling, moving, and assisting in the dismantling of the front and rear doors of a car. The device is pneumatically actuated, with the entire manipulator controlled by three pneumatic cylinders and one balancing system. The thesis describes the whole design procedure of the manipulator and explains the principle of the device's function. The thesis has two main parts. The theoretical part is devoted to the development of manipulators, analysis of the current state of the art, manipulators, robots, and handling devices are described. In the practical part, the selection of several variants is described, selecting the most suitable one. A 3D CAD model and drawings were produced for the selected variant. This section also includes a detailed description of the device and illustrations of the key assemblies of the device.