NOVELTY - A lead wire (1) comprises lead wire metal (2) of nickel, copper or nickel-plated copper, a composite coating layer (5) provided on the lead wire metal, and an insulator (6) on the outer side of the composite layer. The composite layer is formed by the application of a treating solution containing resin component containing polyacrylic acid, and zirconium salt, titanium salt or molybdenum salt. Insulator is sealed by an enclosing component (3).    USE - Used for a non-aqueous electrolyte battery (claimed) used as power supply of electronic device.    ADVANTAGE - The lead wire has good hydrofluoric acid-proof property, and provides a non-aqueous electrolyte battery having a high durability and stable characteristics without peeling and liquid spill. The composite coating layer does not contain hexavalent chromium and trivalent chromium.    DETAILED DESCRIPTION - The lead wire (1) comprises a lead wire metal (2), a composite coating layer (5) on the surface of the lead wire metal at a portion (3a) sealed by an enclosing component (3), and an insulator (6) on the outer side of the composite coating layer. The lead wire metal comprises nickel, copper or nickel-plated copper. The composite coating layer is formed by the application of a treating solution containing a resin component containing polyacrylic acid, and zirconium salt, titanium salt or molybdenum salt. The insulator is sealed by the enclosing component. The lead wire is used for non-aqueous electrolyte battery comprising an anode, a cathode and an electrolyte liquid accommodated in enclosing component, which consists of a laminated film (4) containing a metal foil (4a).    AN INDEPENDENT CLAIM is included for a non-aqueous electrolyte battery.    DESCRIPTION OF DRAWING(S) - The figure shows the perspective diagram of the non-aqueous electrolyte battery.    lead wire (1)    lead wire metal (2)    enclosing component (3)    seal portion (3a)    laminated film (4)    metal foil (4a)    composite coating film (5)    insulator (6)