A computer device with a built-in disk driver is disclosed in the present invention. The thin computer device includes a casing for accommodating at least one electronic component. A sunken structure is disposed on a surface of the casing. The thin computer device further includes a disk driver movably disposed inside the sunken structure. The disk driver includes a tray, a drive motor, a track set, and an optical read-in module. The tray movably connected to the casing for holding an optical disk. The drive motor disposed on the tray. The track set disposed on the tray. The optical read-in module slidably disposed on the track set. The optical read-in module reads information from the optical disk when the tray holds the optical disk and is located outside the sunken structure.