Abstract: A tool box is arranged for mounting onto a truck bed floor coextensively between side walls thereof in adjacency to an associated tailgate of a truck bed. The tool box includes a cavity therewithin, with a top wall mounted to each hypotenuse of each side wall of the housing. The top wall accordingly is canted from the floor upwardly to an upper end of the tailgate when the tailgate is in a secured orientation relative to the truck bed. The tool box housing is arranged to include various support doors as required as used for storage of various tools and the like therewithin.