A film material insert molding method for forming a transparent resin layer on a front surface of a film material having a design portion and a substrate resin layer on a back surface of the film material, includes an intermediate part forming step of forming a first intermediate part having an edge extending radially outward, the edge being disposed at and near an outer peripheral end of a final shape of the film material, a transparent resin layer forming step of forming a second intermediate part including a transparent resin layer, by injection molding, on a front surface of the first intermediate part, with the edge of the first intermediate part being fixed, and a substrate resin layer forming step of forming an insert-molded article including a substrate resin layer, by injection molding, on a back surface of the second intermediate part, the substrate resin layer covering a surface of a radially outer end of the edge.
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