This posture aid (1), which is for supporting the head and back of a user seated in a chair, is provided with: a bottom frame (10) disposed overlapping the front surface or back surface of the back board of a chair a top frame (20) foldably linked to the bottom frame (10) and a cover (50) attached to the bottom frame (10) and the top frame (20). A plurality of belts (40) are provided to the bottom frame, and the bottom frame (10) and top frame (20) can be attached/detached from the back board by means of the belts (40). By means of such a configuration, easier carrying is possible in the state of the bottom frame (10) and top frame (20) being folded up.
