A slot-in type disk apparatus configured to prevent fine traverse base vibration at disk playback. A base body and a lid constitute a chassis outer sheath having a front surface formed with a disk insertion slot. The base body has a traverse base with a spindle motor, a pickup and a driving unit moving the pickup. A cam displaces the traverse base between the base body and the lid. The cam is provided on each of a main slider and a sub-slider. The main slider and the sub-slider are located sideways of the spindle motor and are connected to each other through a cam lever which is moved by the main slider, and the traverse base is displaced by moving the sub-slider. The cam lever has a resilient member which abuts against the traverse base at the time of playback of a disk.