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PROBLEM TO BE SOLVED : To provide a method of cutting a rate earth alloy by a fixed abrasive grain wire saw which can execute cutting by using a cooling fluid mainly composed of water. SOLUTION : In this method of cutting a rare earth alloy, using a wire saw securing abrasive grains to a core wire, the rare earth alloy, placing its part cut by the wire saw in a condition immersed in a cooling fluid mainly composed of water, is cut by making the wire saw run. The cooling fluid is contained with an extreme pressure agent by volumetric reference of 500 ppm or more but 20, 000 ppm or less.