To provide a fiber having durable antistatic function exhibiting antistaticity and functionality highly durable to washing and a method for producing the fiber.

The fiber having durable antistatic function comprises a synthetic fiber substrate coated with an electrically conductive polymer and having a surface resistivity of ≤1×1010Ω wherein at least a part of the conductive polymer coating surface is coated with a functional material. The fiber having durable antistatic function is produced by applying a monomer for forming a conductive polymer to a synthetic fiber substrate in an amount of 0.2-5.0% o.w.f., polymerizing the monomer with an oxidizing agent to coat the synthetic fiber substrate with the conductive polymer and applying a functional material to at least a part of the surface.

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