Optical recording medium and method for manufacturing the same

An optical recording medium, comprising:

• a first disk;
• a second disk;
• and
• an adhesive layer that bonds the first disk to the second disk, wherein
• each of the first disk and the second disk includes:
• a substrate that includes a first surface, a second surface, and a gradient on an outer peripheral portion of the second surface, wherein
• the gradient has a width of 5 mm or more and 10 mm or less,
• the gradient is inclined with respect to the second surface such that a thickness of the substrate decreases in a radial direction, and
• the radial direction is from a center of the substrate to an outer periphery of the substrate;
• a plurality of information signal layers on the first surface;
• an intermediate layer between adjacent information signal layers of the plurality of information signal layers;
• and
• a cover layer that covers the plurality of information signal layers and the intermediate layer, and
• the second surface of the substrate of the first disk faces the second surface of the substrate of the second disk with the adhesive layer interposed therebetween.