A process for producing a metal film-coated material, the process comprising: forming, on a substrate, a polymer layer by directly chemically bonding to the substrate a polymer which has a functional group capable of interacting with a plating catalyst or a precursor thereof, wherein the substrate has a polymerization initiation layer containing a polymerization initiator or having a functional group capable of polymerization initiation, or has a functional group that binds with a functional group of a terminal of the polymer by a coupling reaction; providing a plating catalyst or a precursor thereof to the polymer layer; and performing plating with respect to the plating catalyst or a precursor thereof; wherein the polymer is a copolymer comprising a unit represented by the following Formula and a unit represented by the following Formula: wherein R 1 to R 5 each independently represent a hydrogen atom or a substituted or unsubstituted alkyl group; X, Y and Z each independently represent a single bond, a substituted or unsubstituted divalent organic group, an ester group, an amide group or an ether group; and L 1 and L 2 each independently represent a substituted or unsubstituted divalent organic group, wherein the polymer layer satisfies all of the following requirements to: the saturated water absorption coefficient of the polymer layer as measured in an environment of temperature of 25°C and relative humidity of 50 % is 0.01 to 10% by mass; the saturated water absorption coefficient of the polymer layer as measured in an environment of temperature of 25°C and relative humidity of 95 % is 0.05 to 20% by mass; the water absorption coefficient of the polymer layer as measured after 1 hour of immersion in boiling water at 100°C is 0.1 to 30% by mass; and the surface contact angle of the polymer layer as measured after dropping 5 μL of distilled water thereonto and leaving to stand for 15 seconds in an environment of temperature of 25°C and relative humidity of 50 % is 50 to 150 degrees. forming, on a substrate, a polymer layer by directly chemically bonding to the substrate a polymer which has a functional group capable of interacting with a plating catalyst or a precursor thereof, wherein the substrate has a polymerization initiation layer containing a polymerization initiator or having a functional group capable of polymerization initiation, or has a functional group that binds with a functional group of a terminal of the polymer by a coupling reaction; providing a plating catalyst or a precursor thereof to the polymer layer; and performing plating with respect to the plating catalyst or a precursor thereof; the saturated water absorption coefficient of the polymer layer as measured in an environment of temperature of 25°C and relative humidity of 50 % is 0.01 to 10% by mass; the saturated water absorption coefficient of the polymer layer as measured in an environment of temperature of 25°C and relative humidity of 95 % is 0.05 to 20% by mass; the water absorption coefficient of the polymer layer as measured after 1 hour of immersion in boiling water at 100°C is 0.1 to 30% by mass; and the surface contact angle of the polymer layer as measured after dropping 5 μL of distilled water thereonto and leaving to stand for 15 seconds in an environment of temperature of 25°C and relative humidity of 50 % is 50 to 150 degrees.