NOVELTY - Electrode lead wire element has lead-out portion formed of metal, thin film coating layer formed from metal fluoride or its derivative and resin comprising hydroxyl group or copolymerized resin containing hydroxyl group, and sealant layer that are sequentially laminated on lead-out portion. The sealant layer is thermally bonded onto surface of lead-out portion, and contains thermally bondable polyolefin resin having epoxy functional group at least in portion that is on side of interface between sealant layer and lead-out portion.    USE - The electrode lead wire element is used in nonaqueous batteries (claimed) chosen from secondary battery preferably lithium ion battery, and an electrical double layer capacitor.    ADVANTAGE - The presence of the thin coating layer makes the element to restrain electrolyte solution that permeates from both ends of electrode lead wire elements across its cross-section. Both ends of electrode lead wire element seen in cross-section are crushed, and as thickness of the element is made thinner than cross-sectional center portion, close contact with electrode lead wire element and laminated film become good, and cavity decreases, and hence permeation of electrolyte solution is reduced inside the elements.    DETAILED DESCRIPTION - Electrode lead wire element (18) that led out from a container for nonaqueous batteries, and container being obtained using as an outer packaging material, and film laminate comprising an aluminum foil and a resin film. The element has lead-out portion (21) that is formed of a metal. A thin film coating layer (22) is formed from a metal fluoride or its derivative and resin comprising a hydroxyl group or copolymerized resin containing hydroxyl group, and a sealant layer (23) that are sequentially laminated on the lead-out portion. The sealant layer is thermally bonded onto the surface of the lead-out portion, and contains a thermally bondable polyolefin resin having an epoxy functional group at least in a portion that is on the side of the interface between the sealant layer and the lead-out portion.    DESCRIPTION OF DRAWING(S) - The drawing shows perspective view of electrode lead wire element.    Electrode lead wire element (18)    Lead-out portion (21)    Thin film coating layer (22)    Sealant layer (23)