Abstract
A chair that would change the form according to the posture of users who seat in the chair was developed in order to give the users two suitable seating postures: for working and for resting or thinking. The chair consists of mainly steel frames and nets, and the nets are composed by some different kind materials so that the users would touch the most suitable material at each seating posture. The height and angle of the seat and the materials as well as the form and function were investigated to realize the most comfortable seating. Finally, a real chair was proposed and it was examined to confirm the possibility to be a product.