Loading drive mechanism and disk unit provided with loading drive mechanism

It is an object to provide a loading drive mechanism by which it is possible to manually move a disc tray smoothly, and by which the number of parts can be made relatively small and assembling operation can be carried out easily, and a disc drive provided with the loading drive mechanism. The disc drive 1 comprises a chassis 31, reproducing means for reproducing information recorded in a disc, and a disc tray 51 for holding the disc which is movable between a disc reproducing position and a disc ejection position, the disc drive further comprising a loading drive mechanism 57 for driving the disc tray 51, wherein the loading drive mechanism comprises a rack gear 540 provided on the disc tray 51 and having at least a part thereof which extends linearly along the longitudinal direction of the disc tray 51, a guide groove 550 which is arranged along the rack gear 540, and a second gear 640 which is a drive gear which meshes with the rack gear 540, a second rotation shaft 315 for rotatably mounting the drive gear 640, wherein the rotation shaft 315 engages with the guide groove 550 of the disc tray 51.