A deck board includes a main body member provided with recesses and protrusions, a top base material joined to a top side of the main body member, and a bottom base material joined to a back side of the main body member. A peripheral end of the bottom base material includes a folded portion, and a peripheral end of the top base material includes a folded portion. The folded portion of the bottom base material and the folded portion of the top base material are crushed and integrated into a tip joint, and the tip joint is joined to a side wall of the bottom base material.