A composite material comprising: a web portion; and a flange portion disposed at an end portion of the web portion, wherein the flange portion is formed from a plurality of laminated fiber sheets and has a surface on one side in a laminating direction of the flange portion serving as an inner surface to which the end portion of the web portion is connected and a surface on the other side in the laminating direction of the flange portion serving as an outer surface, the inner surface of the flange portion has a tapered surface that is sloped with respect to the outer surface so that a thickness is reduced from a base portion to which the end portion of the web portion is connected toward a front end portion in the laminating direction, and the flange portion includes an outermost surface fiber sheet disposed on the tapered surface, the outermost surface fiber sheet serving as the fiber sheet on an outermost surface that covers the tapered surface, wherein the flange portion includes a flange laminate that is the plurality of laminated fiber sheets disposed on the inner surface side, and a cap laminate that is the plurality of laminated fiber sheets disposed on the outer surface side, the cap laminate includes an outer surface side tapered portion having a thickness that is reduced from the base portion of the flange portion toward the front end portion in the laminating direction, and the flange laminate includes an inner surface side tapered portion continuous to the outer surface side tapered portion, the inner surface side tapered portion having a thickness that is reduced from the base portion of the flange portion toward the front end portion in the laminating direction, and the outermost surface fiber sheet serving as the fiber sheet on the outermost surface that covers the outer surface side tapered portion and the inner surface side tapered portion. a web portion; and a flange portion disposed at an end portion of the web portion, wherein the flange portion is formed from a plurality of laminated fiber sheets and has a surface on one side in a laminating direction of the flange portion serving as an inner surface to which the end portion of the web portion is connected and a surface on the other side in the laminating direction of the flange portion serving as an outer surface, the inner surface of the flange portion has a tapered surface that is sloped with respect to the outer surface so that a thickness is reduced from a base portion to which the end portion of the web portion is connected toward a front end portion in the laminating direction, and the flange portion includes an outermost surface fiber sheet disposed on the tapered surface, the outermost surface fiber sheet serving as the fiber sheet on an outermost surface that covers the tapered surface, wherein the flange portion includes a flange laminate that is the plurality of laminated fiber sheets disposed on the inner surface side, and a cap laminate that is the plurality of laminated fiber sheets disposed on the outer surface side, the cap laminate includes an outer surface side tapered portion having a thickness that is reduced from the base portion of the flange portion toward the front end portion in the laminating direction, and the flange laminate includes an inner surface side tapered portion continuous to the outer surface side tapered portion, the inner surface side tapered portion having a thickness that is reduced from the base portion of the flange portion toward the front end portion in the laminating direction, and the outermost surface fiber sheet serving as the fiber sheet on the outermost surface that covers the outer surface side tapered portion and the inner surface side tapered portion. a flange laminate that is the plurality of laminated fiber sheets disposed on the inner surface side, and a cap laminate that is the plurality of laminated fiber sheets disposed on the outer surface side, the cap laminate includes an outer surface side tapered portion having a thickness that is reduced from the base portion of the flange portion toward the front end portion in the laminating direction, and the flange laminate includes an inner surface side tapered portion continuous to the outer surface side tapered portion, the inner surface side tapered portion having a thickness that is reduced from the base portion of the flange portion toward the front end portion in the laminating direction, and the outermost surface fiber sheet serving as the fiber sheet on the outermost surface that covers the outer surface side tapered portion and the inner surface side tapered portion.