In combination with a utility truck having an open bed with front and rear walls projecting upwardly from said bed and first and second lateral walls upwardly projecting from said bed and perpendicularly interposed between said front and rear walls, a truck bed cover comprising a frame section comprising a plurality of rigid frame members and a flexible tarpaulin section, said frame members having first and second terminal ends and being fixed at a first end on the first lateral wall and projecting upwardly then laterally then downwardly and being fixed at its second terminal end on the second lateral wall and said rigid frame members together supporting the flexible tarpaulin section, wherein the plurality of rigid frame members includes a rearwardly positioned rear rigid frame member which is pivotally connected on the first and second lateral walls to pivot longitudinally in a vertical arc, respectively, at its first and second terminal ends and there is a supporting rigid frame member positioned adjacent to and longitudinally forward of the rear rigid frame member and from a point adjacent to where the supporting rigid frame member is connected on one of said lateral walls there is at least one arm means which extends to be connected to and support the rear rigid frame member and the lateral walls of the truck bed have a planar top surface and the rigid frame members project upwardly from said planar top surface and a longitudinal track for a wheel having a transverse axle is fixed to the top planar surface of at least one of the lateral walls and at least one of the rigid frame members is pivotally attached at one of its terminal ends to said transverse axle to allow longitudinal movement of said terminal end of said rigid frame member.Ģ.