The alloy steel powder for powder metallurgy is produced by causing a powder containing 0.05-1.5 mass% of Mo, by Mo, to diffusionally adhere to the surface of a steel powder in which 0.02-0.4 mass% of Nb is pre-alloyed. 0.02〜0.4質量%のNbを予合金化した鋼粉の表面に、Mo量で0.05〜1.5質量%のMoを含む粉末を拡散付着させる。 - 特許庁