To improve the mechanical properties of a laminated disc.

A disc substrate D capable of storing different types of information at the same time is molded by packing a molten resin by injection into paired cavities formed when molding dies 1, 2 are clamped together. Then each of the disc substrates D is taken out of the molding dies 1, 2 by a finished product extracting machine after the completion of a molding process, then a reflective film is formed by a reflective film vapor depositing device, and a protecting layer is formed by a protecting film coating device. After that, these substrates D are laminated together by an adhesive applying/attaching device into a single piece of disc VD. Thus it is possible to prevent a distortion, a warp of a twist from being developed in the disc VD, or prevent the laminated faces of the disc from being separated after the lapse of time following the lamination process by laminating the disc substrates D molded by the paired cavities formed by the same molding dies 1, 2 using the same lot of a resin material under the equal conditions.