PROBLEM TO BE SOLVED: To shorten the period of execution by attaching a decorative mat with flexible surface in which the decorative surface materials such as tiles are adhered to the surface of the flexible sheet on the surface of a tread part of a metallic step plate. SOLUTION: A metallic step plate 2 comprises a tread part 3, a falling plate part 4, a rise plate part 5, and a falling fitting plate part 6 which are blanked from one iron sheet and bent. A flexible decorative surface mat 11 in which the decorative surface material such as a tile 10 is attached to the surface of a flexible sheet 9 consisting of a rubber sheet, an asphalt impregnated cloth, etc., through the adhesive is attached to the surface of the step plate 2. The elastic resin joint material 12 is filled in joint grooves between the tiles 10, and an L-shaped mat in which L-shaped tiles 13 are attached to each other and the whole mat 11 is bent at the forward edge is provided at the sheet part corresponding to a corner part consisting of the tread plate part 3 and the falling plate part 4. Noises in going-up/coming-down can be effectively prevented, and the decorative works can be facilitated.