A truck bed extender including an elongated support adapted for securement in a trailer hitch mounted on a truck, and a shorter upright support pivotally mounted at the opposite end of the elongated support, for pivotal rotation from a collapsed position generally alongside said elongated support, to an upright position extending upwardly away from said elongated support. A pair of arms are pivotally mounted to said upright support, generally at the top thereof, for rotation from a collapsed position, in which the arms extend generally side by side upwardly from and generally in alignment with said upright support, outwardly to an operating position in which they extend outwardly in opposite lateral directions away from one another. The truck bed extender can readily be installed into a trailer hitch and erected to provide extended support for items placed in a truck bed, and can be readily collapsed into a generally elongated condition with said upright support and said arms extending generally alongside said elongated support.