PURPOSE: To obtain an adhesive forming adhering surface having large adhering strength and able to be porous with extraction of gelatin powder from said surface by mixing gelatin powder into an adhesive not containing unreacted group reacting with amine group, carboxyl group or OH group.

CONSTITUTION: Gelatin powder is mixed into an adhesive (e.g., one pack-type polyurethane resin adhesive having 25% concentration) not containing unreacted group reacting with amine group, carboxyl group or OH group and not containing isocyanate group or epoxy group as a hardener to afford the aimed adhesive. Various laminated articles adhered using said adhesive are washed using water, hot water or an organic solvent, etc., to elute gelatin powder contained in adhesive layer and adhered layers of porous structure in which pores having fine and uniform diameters are uniformly distributed are obtained.