To provide device and method for recording to an optical disk, the optical disk and device and method for reproducing from it capable of improving recording density by effectively using a detection method such as PP detection without being affected by a low frequency noise.

This optical recorder is constituted of a light modulator 16A as a laser beam position displacement means forming a first modulation signal Vm and a second modulation signal Vn from digital information recorded on the optical disk and displacing a position in the lateral direction of a laser beam Lo according to the first modulation signal Vm and a light modulator 16B as a laser intensity modulation means modulating the intensity of the laser beam Lo according to the second modulation signal Vn. Thus, since the information by the displacement in the lateral direction and the information by the intensity modulation can be superposed and recorded on the same groove, the high density recording is realized.