Optical Disk Device

An optical disk device having a disk motor for rotating an optical disk on which information is recorded or from which information is reproduced,

• wherein the disk motor has a rotor located so as to be concentric with the optical disk rotated by the disk motor;
• the rotor includes a rotor casing having an optical-disk-facing surface opposite an optical disk surface of the optical disk rotated by the disk motor;
• a restraining element to be inserted into a center hole in the optical disk for restraining movement of the optical disk in its radial direction is located on a central portion of the optical-disk-facing surface, and a supporting element for supporting the optical disk surface is placed on a radially outer portion of the optical-disk-facing surface;
• the rotor casing has, on the optical-disk-facing surface, at least one first flow path extending from the outer circumference of the rotor casing to the restraining element to allow the air inside the optical disk device to flow through;
• and
• the restraining element has at least one through-hole connected to the first flow path, and at least one flow hole for allowing the air to flow between the inside and outside of the restraining element.