PURPOSE: To obtain an optical disk in a variable track pitch system with an excellent tracking characteristic and an original disk recorder capable of manufacturing the optical disk with high precision.

CONSTITUTION: A recording area 1 is divided to plural zones 4a-4d with a concentric circular shape. The more the zone is in an outer peripheral side. The more the pitch (p) of a track 3 formed to a spiral shape or the concentric circular shape in relevant zone is made narrower. A transitional area 4 whose track pitch is changed gradually is provided on the switching part of each zone adjacent each other from the track pitch of the zone in an inner peripheral side to the track pitch of the zone in the outer peripheral side. The rotational speed of a feed motor 17 moving in linear a recording optical system 15 in the radial direction of an original disk 11 is controlled by a track address from a formater 33 outputting a preformat signal according to the track address to the recording optical system.