Abstract: The present invention avoids a case in which a pickup lens and a lens protector come into contact with a structure of a disk cartridge and are damaged. When an operation distance is short and there is a disk cartridge 203 and the disk cartridge 203 is not an exclusive cartridge, a moving range of the pickup 107 is restricted or an actuating operation thereafter is stopped depending upon whether the optical disk medium 101 loaded into the optical disk apparatus is an optical disk medium having a short operation distance, whether there is a disk cartridge 203, and whether a structure of the disk cartridge 203 is prevented from coming into contact with a pickup lens or the lens protector which is exclusive for the optical disk medium having the short operation distance.