PURPOSE: To produce a lightweight non-woven fabric exhibiting characteristic functions such as an antistatic property and an antimicrobial property by disposing a thin metal layer on one side of a non-woven fabric comprising thick sheath-core type filaments produced from specific polyesters.

CONSTITUTION: The functional non-woven fabric excellent in the functionality and in the light weight is obtained by preparing a non-woven fabric comprising thick sheath-core type filaments (each filament diameter : 20-1000μm) produced from polyethylene terephthalate as a core component and a copolyester copolymerized with isophthalic acid in an amount of 10-20mol% based on terephthalic acid, polybutylene terephthalate homopolymer or their mixture as a sheath component in the ratio of a core component : to sheath component of 70:30 to 90:10, fusing the filaments composing 70-90% of the non-woven fabric, and subsequently disposing a metal layer having a thickness of ≤100μm on the side (or both the sides) of the non-woven fabric so as not to expose a non- metal part.