Optical disk device

An optical disk device, characterised in that said optical disk device comprises: a digital demodulation circuit (3026) for receiving a signal which is obtained as a result of reproducing from an optical disk and converting into a two-level signal, on which optical disk a digital modulated signal was previously recorded, said digital demodulation circuit performing digital demodulation on the received signal; a digital phase-locked loop circuit (3030) for generating a clock signal which is in phase synchronization with a demodulated signal output by said digital demodulation circuit; and a digital servo circuit (3034) for performing rotation control of said optical disk so as to correct a frequency error and a phase error between said clock signal and a reference clock signal.