R-FE-B RARE EARTH SINTERED MAGNET

In a method for producing an R-Fe-B based rare-earth sintered magnet according to the present invention, a compact of an R-Fe-B based rare-earth magnet powder, including a light rare-earth element RL (which is at least one of Nd and Pr) as a major rare-earth element R, is arranged in a processing chamber such that the compact faces a bulk body including a heavy rare-earth element RH, which is at least one element selected from the group consisting of Dy, Ho and Tb; followed by performing a sintering process; and heating the bulk body and the R-Fe-B based rare-earth sintered magnet body in the processing chamber, thereby diffusing the heavy rare-earth element RH into the R-Fe-B based rare-earth sintered magnet body while supplying the heavy rare-earth element RH from the bulk body to the surface of the R-Fe-B based rare-earth sintered magnet body.