A washing machine comprising: a casing forming an exterior appearance of the washing machine; a tub for containing water suspended inside the casing; a drum for accommodating laundry rotatably provided inside the tub, the drum being provided with one or more lifters along its circumferential surface; a gasket provided between the casing and the tub and comprising a plurality of gasket nozzles (160, 170) spraying water into the drum and a plurality of connectors (123, 124) supplying water to the respective gasket nozzles (160, 170); the gasket nozzles (160, 170) being provided at both sides of a lower portion of the gasket, a first gasket nozzle configured to spray water upwardly toward the inside of the drum from a left lower portion of the gasket and a second gasket nozzle configured to spray water upwardly toward the inside of the drum from a right lower portion of the gasket, wherein each of the first and second gasket nozzle (160, 170) comprises a spray guidance surface for refracting an advancing direction of water supplied through the connector so as to spray the water toward an inside of the drum, and a plurality of protrusions arranged along a width direction of the spray guidance surface on the spray guidance surface; a pump for pressure-feeding water to a pair of circulation hoses (151, 152) respectively connected to the first and second gasket nozzles (160, 170), wherein the pump is configured to supply water simultaneously to the pair of circulation hoses (151, 152); a nozzle unit provided at an upper portion of the gasket, the nozzle unit comprising a spiral nozzle (50, 60) configured to spray water into the drum, and a controller configured to operate the pump while the laundry is repetitively lifted and dropped by a rotation of the drum. a casing forming an exterior appearance of the washing machine; a tub for containing water suspended inside the casing; a drum for accommodating laundry rotatably provided inside the tub, the drum being provided with one or more lifters along its circumferential surface; a gasket provided between the casing and the tub and comprising a plurality of gasket nozzles (160, 170) spraying water into the drum and a plurality of connectors (123, 124) supplying water to the respective gasket nozzles (160, 170); the gasket nozzles (160, 170) being provided at both sides of a lower portion of the gasket, a first gasket nozzle configured to spray water upwardly toward the inside of the drum from a left lower portion of the gasket and a second gasket nozzle configured to spray water upwardly toward the inside of the drum from a right lower portion of the gasket, wherein each of the first and second gasket nozzle (160, 170) comprises a spray guidance surface for refracting an advancing direction of water supplied through the connector so as to spray the water toward an inside of the drum, and a plurality of protrusions arranged along a width direction of the spray guidance surface on the spray guidance surface; a pump for pressure-feeding water to a pair of circulation hoses (151, 152) respectively connected to the first and second gasket nozzles (160, 170), wherein the pump is configured to supply water simultaneously to the pair of circulation hoses (151, 152); a nozzle unit provided at an upper portion of the gasket, the nozzle unit comprising a spiral nozzle (50, 60) configured to spray water into the drum, and a controller configured to operate the pump while the laundry is repetitively lifted and dropped by a rotation of the drum.