The present invention provides a disk apparatus with a reduced thickness which is realized by reducing the space required for holding a disk between the turn table and the clamper as much as possible, while ensuring the space for reliably carrying the inserted disk into the disk apparatus. The disk apparatus of the present invention comprises a floating unit held on a stationary frame through elastic means, and the floating unit comprises a clamping member including a clamper which holds the disk-shaped recording medium, and a disk recording/reproducing-driving member including a turn table, and in that a part of the clamper and a part of the turn table are fitted in each other, when the disk-shaped recording medium is held between the clamper and the turn table.