Optical disk device

A loader chassis is provided with a tray-out switch and a switch lever which is configured to operate the tray-out switch. A disk tray is mounted in the loader chassis in a movable manner between a mounted position and a ejected position in a moving direction and formed with a switch rib which has a first slope surface. The first slope surface has a concave curve shape with respect to the moving direction. When the disk tray is being ejected toward the ejected position, the first slope surface of the switch rib pushes the switch lever so that the switch lever operates the tray-out switch, thereby stopping a voltage supply to a drive motor of the disk tray.