Method for producing a magnet on RFeB-base

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The present invention provides a method of manufacturing a RFeB-based magnet, as a rare earth element R, a light rare-earth element RL, namely, Nd and / or Pr. The method comprises : a step of preparing a pre-magnetized substrate for a RFeB-based magnet from raw material alloy powder of a RFeB-based magnet, with an average particle diameter of less than 5[mu]m; a step of grain boundary diffusion treating by heating the pre-magnetized substrate to a predetermined temperature in a state in which a deposit with a heavy rare-earth element RH, which is Tb, Dy and / or Ho is applied to a surface of the pre-magnetized substrate; a step of machining precision of the pre-magnetized substrate after the grain boundary diffusion treatment to obtain the pre-magnetized substrate in the shape of the final product, thereby producing a precision-worked body; and a step of post-precision-machining heating of a precision-worked body at a temperature of 200 to 900 DEG C.