A washing machine includes a cabinet constituting the external appearance of the washing machine, a tub mounted in the cabinet for receiving wash water, a drum rotatably mounted in the tub for receiving laundry to be washed, a circulation unit for circulating wash water in the inner lower part of the tub through the upper part of the tub, and at least one circulation nozzle for spraying the wash water, supplied by the circulation unit, inwardly of the drum along a rotation axis of the drum in a longitudinal direction of the drum. According to the present invention, it is possible to improve washing or rinsing efficiency of the washing machine.