To provide a method for manufacturing nano complex powder for efficiently absorbing electromagnetic waves at a GHz band in which a utilization range tends to expand following the development of communication equipment by a magnetic medium, such as iron, taken into a matrix, such as carbon.

The nano complex magnetic particle is obtained by mixing amorphous carbon that is a non-good conductor and a magnetic material with a transition metal or its alloy as a base by a physical method. The electromagnetic wave absorber is obtained by adding binder, such as resin, to the nano complex particles.