A disk apparatus comprising a chassis outer sheath having a base body 10 and a lid, in which a front surface of the chassis outer sheath is formed with a disk inserting opening 11 into which a disk is directly inserted, a lever which is operated when the disk is inserted or discharged is provided in the chassis outer sheath, the lever is provided at its movable side end with a guide 17, and the disk is guided by the guide 17, whereinthe guide 17 comprises a stationary portion 101B fixed to the lever, a movable portion 101C which is displaced with respect to the stationary portion 101B, and an elastic body which biases the movable portion 101C in a direction away from the stationary portion 101B.