Processor

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A processing system according to the present invention includes : a diffusion processing section 10 which heats a sintered R-T-B based magnet body 1 and an RH diffusion source 2 made of either a metal or alloy of a heavy rare-earth element RH (which is at least one of Dy and Tb) while rotating; a sorting section 20 which selectively sorts the RH diffusion source 2 from the sintered R-T-B based magnet body 1 when the diffusion source and the magnet body come from the diffusion processing section 10; and a heat treatment processing section 30 which conducts a heat treatment process on the sintered R-T-B based magnet body 1, in which the heavy rare-earth element RH has been diffused and from which the RH diffusion source 2 has been removed.