A dishwashing machine is disclosed. The dishwashing machine includes a tub for providing cleaing space, a rack disposed in a tub to receive objects to be washed, a water supply pump to supply wash water, a nozzle body disposed at an upper side of the rack to receive the wash water from the water supply pump, a discharge hole provided at the nozzle body to discharge the wash water supplied to the nozzle body to the rack, and an asymmetric impeller rotatably provided at the nozzle body to supply the wash water discharged from the discharge hole to at least two divided areas of the rack.