In this thesis stair climbing tools were made for manual wheelchairs. The tool is intended to be used primarily on entrance stairs. It can also be used as an evacuation aid for apartments/workplaces that do not have evacuation sites. At the present time there are only electric commercials aids which are expensive to own. The main problem of the work was to find a stair climbing mechanism. The design must be above all safe and cheap. The group used Fredy Olsson's method which consists of two phases namely principle and primary construction and other methods during work. A force analysis has been performed to confirm that the assistant’s pulling force is reduced during the stair climbing with the aid. The mechanics of material was analyzed with the help of Simsolid and then checked by hand calculations. The project team has at the end achieved a product that fulfills the most requirements that were set from the beginning.