The output of this diploma thesis is a functional prototype of a positioning upholstered armchair in a scale of 1: 1. In the first part we find the history of seating furniture with emphasis on positioning and upholstered armchairs. Furthermore, ergonomic requirements for seating furniture, safety requirements for seating according to standards and, last but not least, current trends in seating furniture. The practical part includes the research, description of the design of the upholstered armchair and its subsequent production, including description of the structure and materials used in the prototype production. The text is accompanied by visualizations of the armchair itself and photographs from prototype production