HOLLOW RESIN MOLDING

PROBLEM TO BE SOLVED: To contrive to increase the strength of a hollow resin molding by effectively reinforcing the position where is high damage frequency. SOLUTION: This hollow resin molding comprises five or more surface parts in such a manner that ribs R for protecting respective vertexes in a cross-state are provided at the three or more sides H of the three or more surface parts erected from the one surface part having maximum projecting area of the respective surface parts. The positions D where the ribs R of the three or more surface parts are erected have the shape retracted by substantially the height of the rib from the other positions of the three or more surface parts so that the front end face of the rib R preferably does not protrude. The molding may be manufactured by blow molding, and a rib R may be formed along the parting lines to be formed at the time of manufacturing. Further, in the molding having vertexes crossed at the three or more surface parts, a rib having a cross-state may be provided at least at one side H of the three or more sides H formed of the three or more surface parts.