the molding core 116 a stationary core 126 constituting a mold 124 along with the integral type molding device 120 made by engaging the stamper 114 and the molding core 116 and a movable core 122 and a stationary molding plate 128 and a movable molding plate 130 for fixing the stationary core 126 and the movable core 122 at the exterior thereof respectively the stamper 114 is manufactured by the nickel electroplating system using a brass plate master like the first embodiment in the second embodiment however since bolt holes are formed in the stamper 114 to engage the stamper 114 and the molding core with bolts the plated electrotype must have a middle thickness of about 6 to 12 mm for the sake of bolt engaging the stamper 114 is put on the molding core 116 and a plurality of bolt engaging holes are formed from the lower portion of the molding core 116 to a desired depth of the stamper 114 by a grinding process bolts 118 are then inserted into the holes to fix the stamper 114 to the molding core 116 by this method the mold structure can not only be simplified but also the stamper 114 can also be stably fixed to the molding core 116 the stamper integrated mold structure employing the bolt engagement system is also applicable to a double faced unevenness molding device for transcription molding both sides of the prism light guide in this case the upper and lower stampers are fixed to the stationary and movable cores respectively by bolts to be integrally formed as described above according to the present invention a light guide molding stamper is fixed to an core material portion by nickel electroplate or by bolt members and.