A supplementary support structure, which supports the body of a robot (1), comprises a contact component (7) which is disposed in a part near a joint (2c) on the distal end, having a hand (3) disposed thereon, of an arm (2) of the robot (1) so as to come into contact with a surface on which the robot (1) is supported, such as a floor surface, and a member which lies between the part having the contact component (7) disposed therein and the proximal end of the arm (2). Thus, the supplementary support structure can avoid an increase in the weight of the hand resulting from the support structure, thus eliminate an extra load on a driving system for the hand or the arm, and thus achieve the simplification and size reduction of the driving system. Moreover, the support structure can increase the degree of freedom of the shape or functional design of the hand and thus improve the functioning of the robot.