To provide a low-cost fine-particle material for preventing an electromagnetic wave to effectively shield and absorb the electromagnetic wave in a wider frequency range among the fine-particle materials for preventing the electromagnetic wave that can be added to a polymer, a plastic material/resin paint or to the basic material of spinning fiber and cement powder or the like.

The fine-particle material for preventing the electromagnetic wave is formed of at least one conductive fine-particle material and the conductive fine-particle material is formed of a granular conductive fine particle including a mixed tube/fiber state structural conductive fine particle or a structural conductive fine particle. A part of the electromagnetic wave absorbing fine-particle material can further be doped into the fine-particle material for preventing the electromagnetic wave in order to enhance capability for absorbing and eliminating or removing the electromagnetic wave.