To provide an unmanned conveying vehicle provided with a transfer device easy in maintenance as to an expansion and contraction mechanism for transfer arms 32, 33.

This unmanned conveying vehicle is provided with the transfer device 3 provided with the expansion and contraction mechanism a slewing mechanism and an elevation mechanism for the transfer arms 32, 33 to transfer an article by the transfer arms 32, 33. The transfer device 3 includes a unit 6 assembled integrally with the transfer arms 32, 33 and the expansion and contraction mechanism, and is removable from portions 4, 5 in which the expansion and contraction mechanism and the slewing mechanism are included.