TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The onium salt compound (C1) is a compound having oxidation ability with respect to carbon nanotubes (A1) and/or conductive polymer (B1), and generates an acid by heat or active energy ray irradiation. The component (C1) is chosen from sulfur-containing compound(s) of formulae: R22-S+(-R21)(-R23).X- (I) and S+(-R21)(-R23)-R24-S+(-R21)(-R23).2X- (II), iodine-containing compound of formula: R25-I+-R26.X- (III), nitrogen-containing compound of formula: R28-N+(-R27)(-R29)-R30.X- (IV), and linear compound of formula: R32-C+(-R31)(-R33).X- (V). The electroconductive composition further contains solvent, 3-50 %mass compound (A2) capable of generating a radical by heat or active energy ray irradiation, 30-80 %mass carbon nanotubes (B2) and 1-20 %mass conductive polymer (C2). The compound (C2) is a compound having oxidation ability by heat or active energy ray irradiation with respect to component (A2) and/or component (B). The component (C2) is aromatic carbonyl compound, acyl phosphine compound, organic peroxide, active ester compound, hexaaryl biimidazole compound, disulfone compound, borate compound, compound having haloalkyl group and/or metallocene compound. The component (D2) is a radically polymerizable compound having two or more radical polymerizable group. The electroconductive composition comprises 3-50 %mass component (A1), 30-80 %mass component (B1), 1-50 %mass component (C1) and 5-50 %mass component (D1).R21-R23,R25,R26,R31-R33=linear, branched or cyclic alkyl, aralkyl, aryl, and heteroaryl;R27-R30=H, linear, branched or cyclic alkyl, aralkyl, aryl, heteroaryl, alkoxy or aryloxy;R24=linear, branched or cyclic alkylene and arylene;X-=anion of strong acid;andtwo of R21-R23,R21+R23,R25+R26,two of R27-R30,two of R31-R33=aliphatic ring, aromatic ring or heterocyclic ring.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The cationic polymeric group of polymeric compound (D1) is epoxy group, oxetane group and/or vinyl ether group. Preferred Material: The base material is a resin film. Preferred Component: The electroconductive conversion element has an electrode. Preferred Process: The electroconductive film is formed by coating electroconductive composition on the base material. Manufacture of electroconductive laminate, which involves performing heating process or active energy ray irradiating process after film forming at 60-150 degrees C for 1-20 minutes. Preferred Definitions:    X-=anion of aryl sulfonic acid, anion of perfluoroalkyl sulfonic acid, anion of perhalogenated Lewis' acid, anion of perfluoroalkyl sulfonimide, or alkyl or aryl borate anions.