PROCESS FOR PRODUCTION OF R-FE-B-BASED RARE EARTH SINTERED MAGNET, AND STEAM CONTROL MEMBER

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An R-Fe-B-based rare earth sintered magnet (1) is provided, which comprises, as the main phase, R2Fe14B-type compound crystals that contain a light rare earth element RL (at least one element selected from Nd and Pr) as the main rare earth element R. A bulky body (2) is provided, which contains a heavy rare earth element RH (at least one element selected from the group consisting of Dy, Ho and Tb). Both the sintered magnet (1) and the bulky body (2) are placed in a treatment chamber (4) while interposing a steam control member (3) between the sintered magnet (1) and the bulky body (2). The interior of the treatment chamber (4) is heated to a temperature of 700 to 1000°C inclusive, so that the heavy rare earth element RH is diffused in the inside of the sintered magnet (1) while feeding the heavy rare earth element RH to the surface of the sintered magnet (1) from the bulky body (2) through the steam control member (3).