Patent ID: 8272126

Claim:
A method of producing a circuit board, comprising: a film-forming step of forming a swellable resin film on the surface of an insulative substrate; a circuit groove-forming step of forming circuit grooves having a depth equal to or greater than the thickness of the swellable resin film on the external surface of the swellable resin film; a catalyst-depositing step of depositing a plating catalyst or the precursor thereof on the surface of the circuit grooves and the surface of the swellable resin film; a film-separating step of swelling the swellable resin film with a particular liquid and then separating the swollen resin film from the insulative substrate surface; and a plating processing step of forming an electrolessly plated film only in the region where the plating catalyst or the plating catalyst formed from the plating catalyst precursor remains unseparated after separation of the swellable resin film, wherein the catalyst-depositing step includes a step of immersing the swellable resin film in an acidic catalyst metal colloidal solution, the film-separating step includes a step of swelling the swellable resin film in an alkaline solution, and the swellable resin film has a swelling degree of 10% or less with respect to the acidic catalyst metal colloidal solution and is capable of swelling in the alkaline solution.