In order to provide a negative electrode material for a lithium-ion secondary battery that achieves both of high capacity and rapid charge/discharge performance, a nano-carbon composite is used as the negative electrode material. The nano-carbon composite 7 includes: low-crystallinity carbon 1; a composite in which a mixture of silicon oxide 2 containing silicon nanoparticles 3 and fibrous carbon 4 are partially or entirely coated with a carbon coating 5; and carbon nanohorn aggregates 6 supported on a surface of the composite.