Abstract: The disclosure relates to a roller intended for a roller conveyor, the roller being mounted by means of bearing pieces on a through-shaft which is journalled by means of ball bearings in a frame. Of the bearing surface of the bearing pieces and the roller ends abutting against this surface, at least one is planar and the other arched, so that the roller, on being influenced by heavy loads, may be bent downward somewhat. The bearing pieces and the surface of the roller ends abutting against them are made of compatible materials, such as plastic and steel. The bearing pieces are fixedly locked to the shaft and each have a radial abutment for restricting the axial movement of the roller. One bearing piece may be provided with a driving wheel which engages with a driving member such as a chain.