Provided is a dishwasher. The dishwasher includes a tub having a receiving space in which objects to be washed are received, a sump for storing wash water supplied into the tub, a heater that heats the wash water in the sump to generate steam, a steam nozzle for spraying the steam into the tub, a filter assembly that purifies the wash water supplied to the sump and communicates with the tub so that the steam generated in the sump is supplied into the tub and a barrier for dividing inner space of the sump into a first section communicating with the filter assembly and a second section communicating with the steam nozzle. The barrier allows the wash water flows between the first and second sections and suppresses flow of the steam from the second section to the first section.