A washing machine with a drum to accommodate laundry, a detergent supply apparatus including a detergent case forming the external appearance of the detergent supply apparatus, a detergent case cover disposed to cover the upper portion of the detergent case, and a dispenser disposed between the detergent case and the detergent case cover, wherein the dispenser is provided with a plurality of channels (521, 522, 523, 524) to supply water to a plurality of detergents to be supplied to the drum and a water supply apparatus comprising: two water supply pipes one being a warm water supply pipe and the other being a cold water supply pipe, extending from a rear portion of the washing machine to the detergent supply apparatus to supply cold and warm water to the dispenser; a nozzle provided with one end connected to the water supply pipes and the other end disposed adjacent to entrances of the plurality of channels (521 to 524) and being rotatable to supply water selectively to one of the plurality of channels; a drive unit generating drive force to rotate the nozzle, and a rotation control device to control rotation of the drive unit, wherein the nozzle includes a wide single inlet provided adjacent to the two water supply pipes such that water is introduced into the nozzle through the inlet, and a single outlet to supply water to one of the plurality of channels (521 to 524), which inlet has an area greater than the single outlet and sufficient to cover two connection pipes to which the two water supply pipes are connected, the connection pipes protruding from the rear portion of the detergent case cover, wherein the warm water supply pipe is connected to one of the two connection pipes and the cold water supply pipe is connected to the other of the two connection pipes, so as to allow cold water and warm water supplied from the two water supply pipes to be introduced into the nozzle through the wide single inlet and out of the nozzle by the single outlet to each one of the channels (521 to 524), selectively. two water supply pipes one being a warm water supply pipe and the other being a cold water supply pipe, extending from a rear portion of the washing machine to the detergent supply apparatus to supply cold and warm water to the dispenser; a nozzle provided with one end connected to the water supply pipes and the other end disposed adjacent to entrances of the plurality of channels (521 to 524) and being rotatable to supply water selectively to one of the plurality of channels; a drive unit generating drive force to rotate the nozzle, and a rotation control device to control rotation of the drive unit, wherein the nozzle includes a wide single inlet provided adjacent to the two water supply pipes such that water is introduced into the nozzle through the inlet, and a single outlet to supply water to one of the plurality of channels (521 to 524), which inlet has an area greater than the single outlet and sufficient to cover two connection pipes to which the two water supply pipes are connected, the connection pipes protruding from the rear portion of the detergent case cover, wherein the warm water supply pipe is connected to one of the two connection pipes and the cold water supply pipe is connected to the other of the two connection pipes, so as to allow cold water and warm water supplied from the two water supply pipes to be introduced into the nozzle through the wide single inlet and out of the nozzle by the single outlet to each one of the channels (521 to 524), selectively.