To obtain metallic fibers having an excellent electromagnetic wave shielding effect and an excellent surface appearance with slight abrasion of a screw, a cylinder and a mold by being made of a metal having a prescribed Vickers hardness and having a diameter reduced to a circle lower than a prescribed value.

This metallic fiber is made of a metal such as copper, aluminum, gold, etc., respectively having ≤150 Vickers hardness and has <50 μm, preferably <40 μm diameter reduced to a circular cross section. Preferably, a thermoplastic resin composition is prepared from 1-70 wt.% of the metallic fibers and 99-30 wt.% of a thermoplastic resin such as polypropylene.