There is provided a sump of a dishwasher having a plurality of nozzles for spraying washing water. The sump includes a sump case for storing the washing water, a sump cover covering the sump case, a self-cleaning filter installed on the sump cover to filter foreign objects contained in the washing water stored in the sump case, a washing pump for pumping out the washing water stored in the sump case, a pump lower receiving the washing pump and providing a soil chamber in which the foreign objects contained in the washing water are accumulated, a washing motor installed on the sump case to drive the washing pump, a drain pump installed on the sump case to drain the washing water, and a drain motor for driving the drain pump.