R-T-B sintered magnet manufacturing method

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A method for producing a sintered R-T-B based magnet includes the steps of : providing a sintered R-T-B based magnet body 1 ; providing an RH diffusion source 2 including a metal or an alloy of a heavy rare-earth element RH (which is at least one of Dy an Tb); loading the sintered magnet body 1 and the RH diffusion source 2 into a processing chamber 3 so that the magnet body 1 and the diffusion source 2 are movable relative to each other and brought close to, or in contact with, each other; and performing an RH diffusion process by conducting a heat treatment on the sintered R-T-B based magnet body 1 and the RH diffusion source 2 at a temperature of 500 °C to 850 °C for at least 10 minutes while moving the magnet body 1 and the diffusion source 2 either continuously or discontinuously in the processing chamber 3.