NOVELTY - A conductive resin composition comprises an electrically conducting filler (A), urethane-modified epoxy (meth)acrylate (B), (meth)acrylate (C) and 1 or more other ethylenically unsaturated monomers (D) copolymerizable with components (B,C). Urethane-modified epoxy (meth)acrylate (B) is obtained by reacting an epoxy (meth)acrylate (b-1) with polyisocyanate (b-2).    USE - For separator for fuel cells (claimed), especially separator of fuel cell of hydrazine type, direct methanol type, alkali type, solid polymer type and phosphate type, for polymer electrolyte fuel cell, and for electrical and electronic components.    ADVANTAGE - The conductive resin composition does not have molding defects such as separation of resin and electrically conducting filler, and occurrence of voids or warpage. The resin composition is excellent in mold-filling properties, and capable of providing fuel cell separator having excellent mold-filling properties.    DETAILED DESCRIPTION - A conductive resin composition comprises electrically conducting filler (A), urethane-modified epoxy (meth)acrylate (B), (meth)acrylate (C) and 1 or more other ethylenically unsaturated monomers (D) copolymerizable with components (B,C). Urethane-modified epoxy (meth)acrylate (B) is obtained by reacting an epoxy (meth)acrylate (b-1) obtained by addition reaction of an epoxy resin having an aromatic cyclic structural unit and/or an alicyclic structural unit with (meth)acrylic acid, with polyisocyanate (b-2). The (meth)acrylate (C) has number average molecular weight of 500-10000, and comprises 20-80 wt.% of aromatic cyclic structural units and/or alicyclic structural units, and is free from active hydrogen. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of conductive resin composition, which involves mixing component (A), epoxy (meth)acrylate (b-1) and polyisocyanate (b-2), activated water, component (C) and component (D), reacting component (b-1) and component (b-2), and performing chain expansion of the kneaded material under room temperature to 80degreesC; and    (2) separator for fuel cells, formed by molding the conductive resin composition.