A disk loading apparatus may include a first retaining device that is arranged in a slot for a disk to be inserted and thereby retains the outer edge of the disk so as to permit it to pass through the slot. A transferring device transfers the disk retained by the first retaining device to a predetermined position. A second retaining device is arranged in the interior from the slot and thereby retains the outer edge of the disk retained by the first retaining device and transferred by the transferring device. A rotating device rotates the disk at the predetermined position. Also, each of the first and second retaining devices has a contact section for contacting with the outer edge, upper surface, and lower surface of the disk in a slidable manner.