Manufacturing method of lens with built-in hologram element

A hologram optical substrate manufacturing method for manufacturing a hologram optical substrate having a hologram element by a use of an optical substrate formed with an inclined surface and hologram photosensitive sheet, comprising:

• a cutting process that employs a laminate sheet having a pair of protective sheets with a hologram photosensitive sheet peelably interposed between the pair of protective sheets, and makes a cut through either one of the protective sheets, from an outer surface of the one of the protective sheets at least to a depth for cutting the hologram photosensitive sheet along a thickness direction of the laminate sheet, the cut corresponding to a hologram element forming section;
• a first peeling process that peels the protective sheet having the cut, from the hologram photosensitive sheet;
• a sticking process that sticks a hologram photosensitive material of the hologram element forming section to an inclined surface of the optical substrate formed with the inclined surface, with the hologram photosensitive material adhered to the other protective sheet;
• a second peeling process that peels the other protective sheet;
• an exposure process that exposes the hologram photosensitive material of the hologram element forming section that is stuck on the inclined surface of the optical substrate, to a laser beam after the second peeling process;
• and
• a developing process that develops the exposed hologram photosensitive material of the hologram element forming section so as to form a hologram element.