An improved push back pallet rack for loading and unloading pallets in which parallel channels inclining upward and rearward from a front of the rack on which pallets are stored are joined along their length and have longitudinal grooves, convex within each channel, to provide a lateral bumper guide(s) and a track on which carrier rails to support a pallet are mounted with rollers having concave rolling surfaces to roll on the track and are adapted with self-righting rolling surfaces.
