A wind turbine blade, comprising: an aerofoil part extending between a blade root part and a blade tip part; a shear web provided in a longitudinal direction of the wind turbine blade to partition an interior space of the aerofoil part into a first space on a leading edge side and a second space on a trailing edge side; and a deicing apparatus for removing ice attached to the leading edge, wherein the deicing apparatus comprises: a pipe provided inside the first space and extending to a blade tip side region from a blade root side region in the first space, the pipe having a pipe opening disposed in the blade tip side region; a circulation unit for forming a circulation flow of air in a circulation passage which includes a pipe-inner passage formed inside the pipe and a pipe-outer passage formed by a region outside the pipe in the first space and communicating with the pipe-inner passage via the pipe opening; a heated-air generation unit provided on a blade root part side and configured to heat the air flowing in the circulation passage so as to generate heated air; and an ejection tube which is provided in the blade root side region, the ejection tube being shorter than the pipe and having one end opening to the first space and being configured to eject the heated air from said one end; wherein the circulation passage is configured to direct the heated air to the pipe-outer passage, wherein an accommodation space is formed in the blade root part, the accommodation space accommodating the circulating unit and the heated-air generation unit, wherein the accommodation space includes a communication passage for communicating a blade root side end of the pipe with a blade root side end of the ejection tube, the wind turbine blade being characterized in that the accommodation space is formed by the aerofoil part on the blade root side, a FRP plate which defines a borderline on the blade tip side, and a metal plate which forms a borderline on the blade root side. an aerofoil part extending between a blade root part and a blade tip part; a shear web provided in a longitudinal direction of the wind turbine blade to partition an interior space of the aerofoil part into a first space on a leading edge side and a second space on a trailing edge side; and a deicing apparatus for removing ice attached to the leading edge, wherein the deicing apparatus comprises: a pipe provided inside the first space and extending to a blade tip side region from a blade root side region in the first space, the pipe having a pipe opening disposed in the blade tip side region; a circulation unit for forming a circulation flow of air in a circulation passage which includes a pipe-inner passage formed inside the pipe and a pipe-outer passage formed by a region outside the pipe in the first space and communicating with the pipe-inner passage via the pipe opening; a heated-air generation unit provided on a blade root part side and configured to heat the air flowing in the circulation passage so as to generate heated air; and an ejection tube which is provided in the blade root side region, the ejection tube being shorter than the pipe and having one end opening to the first space and being configured to eject the heated air from said one end; wherein the circulation passage is configured to direct the heated air to the pipe-outer passage, wherein an accommodation space is formed in the blade root part, the accommodation space accommodating the circulating unit and the heated-air generation unit, wherein the accommodation space includes a communication passage for communicating a blade root side end of the pipe with a blade root side end of the ejection tube, the wind turbine blade being characterized in that the accommodation space is formed by the aerofoil part on the blade root side, a FRP plate which defines a borderline on the blade tip side, and a metal plate which forms a borderline on the blade root side.