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PURPOSE : A rare earth permanent magnet is provided to improve exchange interaction between atoms inside Nd-Fe-B permanent magnet by adding Ga to the Nd-Fe-B permanent magnet.CONSTITUTION : An Nd-Fe-Ga-B type rare earth permanent magnet is formed by rapidly solidifying mixture of Ga and an alloy for Nd-Fe-B type magnet. The Nd-Fe-Ga-B type rare earth permanent magnet has radiation resistance. The Nd-Fe-Ga-B type rare earth permanent magnet has a coercive force less than 0.02%% under absorbed dose of 200 Mrad. The Nd-Fe-Ga-B type rare earth permanent magnet has reduction of Curie temperature less than 4°C under absorbed dose of 200 Mrad.© KIPO 2009