Optical disk, method for producing the same, and apparatus for producing the same

摘要

An optical disk (10) of the present invention includes a first substrate (11) having a signal area (SA) on a principal plane (11a) and a central hole (A), and a second substrate (12) that is transparent and attached to the first substrate (11). The second substrate (12) is thinner than the first substrate (11), and has a central hole (B) whose diameter is larger than that of the first substrate (11). The first substrate (11) and the second substrate (12) are attached to each other with radiation curable resin (adhesive member) (13) disposed therebetween so as to extend at least from an inner peripheral edge (12s) of the second substrate (12) to an outer peripheral edge (12t) thereof.