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PROBLEM TO BE SOLVED : To provide a compound for a rare earth system nanocomposite magnet more excellent in filling performance than ever before, and to provide its manufacturing method. SOLUTION : The powdery compound for the nanocomposite magnet includes the magnetically-isotropic rare earth system nanocomposite magnetic powder, and a resin of not less than 0.5 mass% nor more than 5.0 mass% of all. Regarding particle size distribution, a particle size D95 with a 95 mass% cumulative mass is in a range of not less than 45 μm nor more than 300 μm, and for a value of the D95 αμm, the particle with its diamter of not less than 0.75 αμm is included not less than 20 mass% nor more than 90 mass%, and the particle with its diameter of not more than 0.4 αμm is included not less than 12 mass% nor more than 50 mass%. COPYRIGHT : (C)2007, JPO&INPIT