Floor structure including plate-shaped supporting portion

A floor structure comprising a plurality of structural metal components that each have:

• a plate-shaped supporting portion that is laid either perpendicular or oblique to an installation surface;
• a plate-shaped top flange that extends from a top end portion of the supporting portion in parallel with the installation surface;
• a plate-shaped bottom flange that extends from a bottom end portion of the supporting portion in parallel with the installation surface and in the opposite direction from the top flange, wherein the structural metal components are laid on a flat surface in parallel with each other such that the top flange of one of the mutually adjacent structural metal components covers the bottom flange of the other of the mutually adjacent structural metal material, thereby forming a floor structure, an end structural metal component at an end portion of the floor structure having a different cross section than the other structural metal components;
• wherein the end structural metal component comprises a U-shaped end component that extends from an end portion of the top flange or the bottom flange, with sides of the U-shaped end component being in parallel with the supporting portion and in the direction of the supporting portion, and an entire outermost side among the sides of the U-shaped end component is flat from a top to a bottom thereof.