To safely supporting a posture in a long period.

This posture supporting tool consists of a bar 1 for housing user's legs at the time of standing the upper half of the body or sitting on its lower side and for allowing the user to hook his arms or to lean his chest on its upper side in addition to his arms, and side plates 2 horizontally supporting the bar 1 from both sides and preventing the user from tilting to a side. An installing face 3 capable of independently standing against a load added by the user is formed at the bottom part of the plates 2.