A support element for a heddle frame is formed by profiled pieces (1, 1) at each end that consist of a polymeric material. The profiled pieces (1, 1) are connected to one another at each side by at least two side pieces (2, 2) made of a metallic material. At the inside cavity of the body formed by the profiled pieces (1, 1) and the side pieces (2, 2) there is a separate core (4) arranged, and the inner surfaces of the side pieces (2, 2) are provided with a layer of insulating material.