A dishwasher includes: a case; a tub; a door; a sump disposed below the tub and configured to store washing water; a spray nozzle configured to spray washing water into the tub; a heater configured to heat washing water and generate steam; a steam nozzle disposed at the door or the tub and configured to discharge steam to the tub; a first rack disposed in the tub and configured to receive a washing target to be washed by washing water sprayed from the spray nozzle; and a second rack disposed in the tub and configured to receive a washing target to be washed by steam supplied from the steam nozzle. The steam discharged from the steam nozzle is supplied to an inside of the second rack through one of a lower surface or a circumferential surface of the second rack.