To solve such a problem that it is difficult to make a patient with sever disease assume a sitting posture because there may be a case the patient can not support patient's head part, because it is difficult for patient to move each part of a body by patient's will in the case of the patient who is not conscious, even in the case of making the patient assume the sitting posture in a conventional sitting posture assisting apparatus.

A prone condition sitting posture assisting apparatus 1 comprises a frame part 10 having a predetermined height, an upper body front face side mounting part 20 arranged above the frame part 10, a body part fixing part 30 fixed to the frame part 10 and overhanging the lateral side of the upper body front face mounting part 20, and a caster part 40 arranged below the frame part 10 and retractable into the frame part 10.