A method of manufacturing a rare earth magnet

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a rare earth magnet that does not use heavy rare earth metal and can perform diffusion and impregnation processing on a modified alloy increasing coercive force at a lower temperature than a conventional method of manufacturing a rare earth magnet, can carry out the diffusion and impregnation on the modified alloy sufficiently in an inert gas atmosphere, and can manufacture the rare earth magnet having high coercive force while lowering material costs and manufacturing costs based upon facility costs.SOLUTION : In a method of manufacturing a rare earth magnet by bringing a modified alloy made of an RE-Y alloy (Y : metal element excluding heavy rare earth elements) into contact with a molding of a metal structure comprising an RE-Fe-B-based main phase (RE : at least one kind between Nd and Pr) and a grain boundary phase of an RE-X alloy (X : metal element) at a periphery of the main phase, and performing a heat treatment to diffuse a melt of the modified alloy and to impregnate the molding, the heat treatment is carried out in an inert gas atmosphere at a temperature raised above the melting temperature of the RE-Y alloy exceeding 400°C, and in the process of raising the temperature, a temperature range of 260 to 400°C is adjusted for less than 120 seconds.