Optical disc and optical disc device

Provided is an optical disc device in which a region unit is configured from a plurality of address information units, address information formed in the address information units included in the region unit is the same, and the regions selected from the address information units included in the region unit are different from each other, the optical disc device being provided with: an address detection value storage unit that stores address detection values of the address information units included in the region unit; storing address detection values of a plurality of address information units included in the area unit; a selection and addition unit that selects and adds the address detection values stored in the address detection value storage unit on the basis of the region determined by the detection region determination unit; and an address information unit position determination unit that determines position information on the basis of the area determined by the detection area determination unit. 提供一种光盘装置