A method of producing a rare-earth sintered magnet-forming sintered body to be sintered by heating a rare-earth magnet-forming material to a sintering temperature while applying a pressure to the rare-earth magnet-forming material in a sintering die, the rare-earth magnet-forming material comprising magnet material particles each containing a rare-earth substance and having an easy magnetization axis, the rare-earth magnet-forming material being obtained by, before heating and sintering a composite material obtained by mixing the magnet material particles with a thermoplastic resin, releasing, by heat, the thermoplastic resin from the composite material, and the rare-earth sintered magnet-forming sintered body being composed of a sintered body in which the magnet material particles are integrally sintered, the method comprising: charging the rare-earth magnet-forming material comprising the magnet material particles into the sintering die having a cavity with a shape corresponding to that of a rare-earth sintered magnet as a final product; heating the rare-earth magnet-forming material to the sintering temperature while applying a given magnitude of pressing force to the rare-earth magnet-forming material charged into the sintering die and thus sintering the rare-earth magnet-forming material, to thereby form the sintered body in which the magnet material particles are integrally sintered, wherein the temperature rise rate before achieving a maximum achieving temperature is 20°C/min or more; after sintering the rare-earth magnet-forming material, subjecting the sintered body to high-temperature heat treatment, under a pressure lower than the pressing force during the sintering and under a maximum achieving temperature which ranges from greater than 900°C to 1100°C, and whose difference from the maximum achieving temperature during the sintering under pressure is within 250°C, and after the high-temperature heat treatment, subjecting the sintered body to low-temperature heat treatment under a temperature of 350 °C to 650 °C. charging the rare-earth magnet-forming material comprising the magnet material particles into the sintering die having a cavity with a shape corresponding to that of a rare-earth sintered magnet as a final product; heating the rare-earth magnet-forming material to the sintering temperature while applying a given magnitude of pressing force to the rare-earth magnet-forming material charged into the sintering die and thus sintering the rare-earth magnet-forming material, to thereby form the sintered body in which the magnet material particles are integrally sintered, wherein the temperature rise rate before achieving a maximum achieving temperature is 20°C/min or more; after sintering the rare-earth magnet-forming material, subjecting the sintered body to high-temperature heat treatment, under a pressure lower than the pressing force during the sintering and under a maximum achieving temperature which ranges from greater than 900°C to 1100°C, and whose difference from the maximum achieving temperature during the sintering under pressure is within 250°C, and after the high-temperature heat treatment, subjecting the sintered body to low-temperature heat treatment under a temperature of 350 °C to 650 °C.