In a method and a device for accessing an optical disc such as a Compact Disc, a CD-ROM, a CD-I and a MD, an optical disc in which data is recorded or to be recorded at a constant linear velocity is rotated at a substantially constant number of revolution per unit time and this optical disc is accessed on the basis of a clock signal which changes its frequency in accordance with an access position (i.e., a read position or write position). Since random accessing is made in a state in which the optical disc is rotated at a substantially constant number of revolution per unit time, it is not necessary to wait in accessing until a stable revolution number is attained but the waiting time is determined only by time required for moving of the read head. This enables the waiting time to be reduced and thereby realizes accessing to the optical disc at a higher speed.