A fan rotor blade (1) includes a blade body (10) made from a composite material of a resin and fibers, and having a pressure surface (10a) facing one side in a rotation direction and a suction surface (10b) facing the other side in the rotation direction. The blade body is provided with a sheath (20) which is more rigid than the blade body and is fixed to the blade body in a state where the sheath covers a leading edge portion of the blade body, which is located on an upstream side in the direction of intake of external air, and the vicinity thereof. A tip end portion (21b) of the sheath extends from the leading edge portion side of the blade body to a trailing edge portion side of the blade body. An end portion of the tip end portion (21b) of the sheath is flush with the trailing edge portion of the blade body.