A building material comprising: a substantially rectangular plate-shaped building material body that includes a first face and a design surface within the first face ; and a protective sheet (S1) affixed to the building material body in a peelable manner, wherein the design surface includes a covered region (C4) that is covered with the protective sheet (S1) and thereby protected, and an exposed region (B4) that is not covered with the protective sheet (S1) and that extends along a first design end portion and a second design end portion , the first design end portion being an end portion of the design surface , the second design end portion being an opposite end portion of the design surface to the first design end portion , wherein the design surface includes a first design surface being a flat surface located between second design surfaces , one of the second design surfaces located between an end portion of the first design surface and the first design end portion , and that inclines with respect to the first design surface , the other of the second design surfaces located between an opposite end portion of the first design surface and the second design end portion , and that inclines with respect to the first design surface , characterized in that the exposed region(B4) includes a pair of the exposed regions(B4), each of the exposed regions(B4) respectively includes the second design surface and a flat portion of the first design surface spaced inward from the second design surface , wherein when a pair of the building materials are stacked in such a manner that one of the first faces abuts on another of the first faces , the exposed regions(B4) are formed so as to be individually protected by the corresponding other protective sheets(S1) . a covered region (C4) that is covered with the protective sheet (S1) and thereby protected, and an exposed region (B4) that is not covered with the protective sheet (S1) and that extends along a first design end portion and a second design end portion , the first design end portion being an end portion of the design surface , the second design end portion being an opposite end portion of the design surface to the first design end portion , wherein the design surface includes a first design surface being a flat surface located between second design surfaces , one of the second design surfaces located between an end portion of the first design surface and the first design end portion , and that inclines with respect to the first design surface , the other of the second design surfaces located between an opposite end portion of the first design surface and the second design end portion , and that inclines with respect to the first design surface , characterized in that the exposed region(B4) includes a pair of the exposed regions(B4), each of the exposed regions(B4) respectively includes the second design surface and a flat portion of the first design surface spaced inward from the second design surface , wherein when a pair of the building materials are stacked in such a manner that one of the first faces abuts on another of the first faces , the exposed regions(B4) are formed so as to be individually protected by the corresponding other protective sheets(S1) . <EOS>