To provide an optical disk capable of recording/reproducing the AV information of a higher-density and larger capacity, and a device and a method for recording/reproducing the optical disk.

The optical disk is constructed in such a manner that a single spiral track constituted of groove/land tracks G and L alternately connected for each track is formed, a recording area is divided into zones in a radial direction, the phases of wobbles wobbled on the left-and-right walls of the groove track G are always similar in the zone, wobbling is executed between the zones so that the track length of one wobble is roughly constant, auxiliary information FG containing address information corresponding to the track G is recorded at a predetermined interval by subjecting one side wall to wobbling demodulation in each track G, and the position of this auxiliary information FG and the position of auxiliary information GL corresponding to an adjacent track L recorded in the side wall are arranged without being arrayed in similar phase. Especially, the pieces of auxiliary information FG and FL are alternately arranged at equal intervals, and arranged by a different cycle only in the vicinity 9 of the front of the contact C of an optical beam scanning direction.