Rare earth magnets, rare earth magnet and a method of manufacturing a rotary machine

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PROBLEM TO BE SOLVED : To provide a rare earth magnet having excellent corrosion resistance.SOLUTION : A rare earth magnet 100 comprises an R-T-B based magnet element 10 containing a light rare earth element R, a transition metal element T and boron B, and a protective layer 20 covering the surface of the magnet element 10. The protective layer 20 contains R, T and Al, and the magnet element 10 and the protective layer 20 each contain Fe as T. Content of Rin the protective layer 20 is 31-40 atom% for the total amount of R, T and Al in the protective layer 20, content of T in the protective layer 20 is 35-64 atom% for the total amount of R, T and Al in the protective layer 20, and content of Al in the protective layer 20 is 5-25 atom% for the total amount of R, T and Al in the protective layer 20.