Abstract: The apparatus for transporting workpiece holders in circulation between a charging station (16), a work station (22) and a discharge station (26) has a carriage (20) with two sockets (36, 38) for workpiece holders (12) to be placed on it from above. The carriage can be moved between a front position and a rear position. In the first of these, one work piece holder (12) each with a workpiece can be set on the first and the second sockets. In the other position, the two workpiece holders (12) can be lifted from the carriage (20), and the workpiece holder (12) located in the work station (22) is clamped against the underside of a frame (24). From the discharge station (26), a conveyor system (14) transports the workpiece holders (12) back to the charging station (16).