A rare earth magnet, a motor, and a motor device comprising

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PROBLEM TO BE SOLVED : To provide an R-T-B rare earth magnet capable of maintaining a maximum energy product even after high temperature exposure exceeding 150°C, and excellent in the temperature cycle characteristics repeating temperature rising and temperature lowering, and to provide an electric motor including the rare earth magnet, and a device including the electric motor.SOLUTION : In an R-T-B rare earth magnet containing crystal particles 1 having a tetragonal RTB compound (where, R is a rare earth element, T is an iron group element, and B is boron) as the main phase, shape memory alloy nanoparticles 2 are dispersed at least into the crystal particles 1.