A method for forming a polymerized film on a surface of a non-conductive material and subsequently forming an electroless metal plating film on the surface is described. The method includes the step of contacting the surface of the material with a solution including (A) an amine compound having at least two functional groups, where at least one of the functional groups is an amino group, and (B) an aromatic compound having at least one hydroxyl group on the aromatic ring.