In order to move vertically a traverse unit in a tray-carrying disk device without using a laterally sliding movable rod, the traverse unit is provided at rear end portions thereof with the chassis pivotably supported by connecting members of an elastic material, and the substantially U-shaped traverse holder having arms extending from both ends thereof and pivotably connected to a front end portion of the chassis by connecting members of an elastic material, the arms being provided at front ends thereof with pivots for pivotably supporting the traverse unit, and at the base end portions thereof with outwardly projecting guide pins, the tray being provided on both side portions of a lower surface thereof with ribs having guide grooves in which the guide pins are loosely fitted, the guide grooves having differences in height, the traverse unit being moved up when the tray is moved back and housed in the device, to render the traverse unit possible to mount the disk on the tray on the turntable.