RARE EARTH MAGNET AND MANUFACTURING METHOD THEREFOR

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A rare earth magnet of the invention has a composition represented by the compositional formula RaHbFecCodBeMf, where : R is at least one rare earth element including Y; H is at least one heavy rare earth element from among Dy and Tb; M is at least one element from among Ga, Zn, Si, Al, Nb, Zr, Ni, Cu, Cr, Hf, Mo, P, C, Mg, and V; 13≦a≦20; 0≦b≦4; c=100−a−b−d−e−f; 0≦d≦30; 4≦e≦20; 0≦f≦3, and has a structure constituted by a main phase : a (RH)2(FeCo)14B phase, and a grain boundary phase : a (RH)(FeCo)4B4 phase and a RH phase, with a crystal grain size of the main phase of 10 nm to 200 nm.