A dishwasher with oscillating spray module

A dishwasher comprises a cabinet (10, fig 1) which forms an exterior appearance thereof, the cabinet (10, fig 1) having a door (12, fig 1) on one side thereof, which can be opened and closed, a tub (20, fig 1) provided in the cabinet (10, fig 1) to form a cleaning object housing space, a rack (34, fig 1) provided in the tub (20, fig 1) for securing cleaning objects thereto, a spray module 100 rotatably provided for spraying cleaning water toward the cleaning objects, and a supply flow passage for supplying the cleaning water to the spray module 100, wherein the spray module 100 is configured so as to be rotated by a reaction force to a spray force of the cleaning water. The spray module 100 may comprise propulsion holes 1116b positioned on momentum arms 116 with the spray module 100 being detachably coupled to the underside of the rack (34, fig 1). The spray module 100 may be arranged to rotate in first and second directions by first and second propulsion holes 116 b so that it oscillates.