To provide a floor board of reduced warpage having a sufficient strength.

This floor board is constituted to be integrated, via an adhesive 7, with a fiber sheet 1 bonded respectively with a moisture-proof decorative sheet 2 in a surface side, and a moisture-proof sheet 3 in a reverse face side, on a single-sheet laminated sheet 6 laminated with a plurality of single sheets 6a-6d via the adhesive. The single-sheet laminated sheet is laminated with the four single sheets via the adhesive, fiber directions of the single sheets 6a, 6d positioned in the surfacemost side thereof and the reverse-face-most side thereof are substantially conformed with a longitudinal direction of the floor board, and fiber directions of the two single-sheets 6b, 6c positioned between the surfacemost side and the reverse-face-most side are substantially conformed with a direction orthogonal to the longitudinal direction of the floor board.