An optical disk production device characterized by comprising a nozzle for jetting a cation type ultraviolet curable composition, an ultraviolet ray irradiation means for applying an ultraviolet ray while the cation type ultraviolet curable composition falling from the nozzle reaches a disk substrate, and an overlapping means for overlapping two disk substrates one upon another to form one disk with surfaces on which the ultraviolet curable composition has fallen facing each other, wherein the device is preferably provided with a flat stationary placement surface for mounting the disk thereon because the cation type ultraviolet curable composition is stretched between the two overlapped disk substrates overlapped by the overlapping means, the device preferably further comprising a stacking means for stacking a plurality of the disks and a rigid disk placing means for placing a rigid disk having a flat surface on the disks while the plurality of disks are stacked.