A manufacturing method of a rare earth magnet and impregnating device

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Disclosed is a method for producing an R-Fe-B rare earth magnet comprising a pressing step (A) wherein a molded body (20) is formed by compression molding a rare earth alloy powder by dry pressing; a step (B) wherein the molded body (20) is impregnated with an antioxidant through the surface thereof; and a step (C) wherein the molded body (20) is sintered. In the step (B), the molded body (20) is impregnated with the antioxidant within a container (100) wherein the pressure is reduced.