To provide a floor panel having high strength and superior productivity, not causing any problem even when a vehicle passes thereon, capable of changing the direction of air, and having no orientation for installation.

This floor panel 1 is formed in a rectangular shape in which the four sides are surrounded by frame parts 3. Parallel ribs 5, 6 as first ribs and diagonal ribs 7 as second ribs are disposed in the floor panel. Holes in the floor panel are formed of the diagonal ribs 7 at an angle of 45 relative to the frame parts 3. The arrangement of the diagonal ribs 7 in the floor panel 1 is parallel to the frame parts extending through a center point 9, symmetrical with respect to a centerline (parallel rib 5) in at least one direction, and symmetrical with respect to the center point 9.