TREATMENT DEVICE

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Disclosed is a treatment device equipped with : a diffusion part (10) which rotates while heating an R-T-B sintered magnet (1) and an RH diffusion source (2) comprising the metal or an alloy of a heavy rare-earth element (RH) (at least Dy or Tb); a separation part (20) in which the RH diffusion source (2) is selectively separated from the R-T-B sintered magnet (1) and RH diffusion source (2) which have been received from the diffusion part (10); and a heat treatment part (30) in which the R-T-B sintered magnet (1) into which the heavy rare-earth element (RH) has been diffused and from which the RH diffusion source (2) has been removed is heat-treated.