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The magnetic properties of Fe-Si-BPC-Cu nanocrystalline powders were investigated. Fe-Si-BPC-Cu powders with a mostly amorphous structure were prepared by an atomization method. The atomized powders were annealed in inert gas atmosphere for nanocrystallization. The Fe 84.8 Si 0.5 B 9.4 P 3.5 C 1 Cu 0.8 nanocrystalline powder exhibits high B s of 1.76 T, which is appreciably higher than that of conventional Fe-based amorphous powders (1.3-1.5 T) and close to that of Fe 3.5 Si 4.5 Cr (1.86 T) crystalline one. The magnetic loss of toroidal core made of the Fe 84.8 Si 0.5 B 9.4 P 3.5 C 1 Cu 0.8 nanocrystalline powder is also the lowest compared to that of amorphous and crystalline counterparts. This result indicates that Fe-Si-BPC-Cu nanocrystalline powders could contribute in efficiency-improvement as well as miniaturization of soft-magnetic cores.