PURPOSE: To prevent the fringe part of a disc board from generating flashes, by a method wherein prior to or posterior to peeling of the board in a state of a flat plate, to which an already-cured resin film, to which a form of a stamping surface of a stamper is transferred, is stuck, from the stamper, an uncured part of curing resin is removed.

CONSTITUTION: A guide groove 9 is formed by curing an ultraviolet-curing resin film 2a by applying ultraviolet rays 8 of the outside of a treatment device 4 onto a disc board 1 for 30 seconds by transmitting through an upper plate 7 made of glass and further through the top part made of the glass of an inner chamber 5 under a state where the disc board 1 and a stamper 3 are pressure-contacted together. In addition, parts of an ultraviolet-curing resin film 2a corresponding to shading patterns 3c, 3d are not exposed and kept as it is uncured, in this curing treatment. With this curing treatment, an already-cured part of the ultraviolet-curing resin film 2a and a disc board 1 are stuck to each other. Then since an outer circumferential surface of the disc board 1 is covered with a part of the shading pattern 3c obtained by overhanging in a state of eaves, sticking of resin to its outer circumferential surface through curing of the resin can be prevented effectively.