Rare earth magnet and its production method

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The present invention has aimed to provide a method which is capable of producing a rare earth magnet having a protective layer that can provide a sufficient water resistance. The present invention provides a method for producing a rare earth magnet comprising a magnet body containing a rare earth element and a protective layer with high water resistance formed on the surface of the magnet body, the method comprising a first step in which a zinc compound soluble in an alkaline solution is dissolved in an alkali silicate solution to prepare a treatment solution, a second step in which the treatment solution is attached on the surface of the magnet body, and a third step in which the treatment solution attached on the magnet body surface is cured to form a protective layer comprising the cured product of the treatment solution.