An electroconductive-film-forming composition comprising: copper particles having an average particle diameter of 1 nm to 10 μm; copper oxide particles having an average particle diameter of 1 nm to 500 nm; a reducing agent having a hydroxy group; a metal catalyst including metals other than copper; and a solvent, wherein the content of the copper oxide particles is 50% by mass to 300% by mass with respect to the content of the copper particles, the content of the reducing agent is 100 mol% to 800 mol% with respect to the content of the copper oxide particles, the content of the metal catalyst is 10% by mass or less with respect to the content of the copper oxide particles, the reducing agent is selected from alcohols, ascorbic acid, sugar alcohols, saccharides, hydroxy ketones, amino alcohols, polyhydric alcohols, glyoxylic acid, glycolic acid, or polyethylene oxide, the metal catalyst is a metal catalyst including at least one metal selected from the group consisting of palladium, platinum, nickel, and silver, and the average particle diameter refers to an average primary particle diameter which is obtained by measuring the particle diameters of at least 50 or more copper particles through observation using a transmission electron microscope and arithmetically averaging the values of the diameters, and measuring the major axis as diameter when the copper particle is not a round shape. copper particles having an average particle diameter of 1 nm to 10 μm; copper oxide particles having an average particle diameter of 1 nm to 500 nm; a reducing agent having a hydroxy group; a metal catalyst including metals other than copper; and a solvent, wherein the content of the copper oxide particles is 50% by mass to 300% by mass with respect to the content of the copper particles, the content of the reducing agent is 100 mol% to 800 mol% with respect to the content of the copper oxide particles, the content of the metal catalyst is 10% by mass or less with respect to the content of the copper oxide particles, the reducing agent is selected from alcohols, ascorbic acid, sugar alcohols, saccharides, hydroxy ketones, amino alcohols, polyhydric alcohols, glyoxylic acid, glycolic acid, or polyethylene oxide, the metal catalyst is a metal catalyst including at least one metal selected from the group consisting of palladium, platinum, nickel, and silver, and the average particle diameter refers to an average primary particle diameter which is obtained by measuring the particle diameters of at least 50 or more copper particles through observation using a transmission electron microscope and arithmetically averaging the values of the diameters, and measuring the major axis as diameter when the copper particle is not a round shape. the content of the metal catalyst is 10% by mass or less with respect to the content of the copper oxide particles, the reducing agent is selected from alcohols, ascorbic acid, sugar alcohols, saccharides, hydroxy ketones, amino alcohols, polyhydric alcohols, glyoxylic acid, glycolic acid, or polyethylene oxide, the metal catalyst is a metal catalyst including at least one metal selected from the group consisting of palladium, platinum, nickel, and silver, and the average particle diameter refers to an average primary particle diameter which is obtained by measuring the particle diameters of at least 50 or more copper particles through observation using a transmission electron microscope and arithmetically averaging the values of the diameters, and measuring the major axis as diameter when the copper particle is not a round shape.