The present invention relates to a dishwasher. In more detail, the present invention provides a dishwasher including a sump housing for holding washing water, a washing water pumping unit for pumping the washing water, a drain chamber for receiving the washing water pumped thus, a soil chamber for receiving the washing water through the drain chamber, a guide assembly for guiding the washing water pumped thus to be provided to the soil chamber via the drain chamber, and a sump cover covered on an upper surface of the sump housing for filtering the washing water overflowed from the soil chamber, thereby filtering the washing water effectively, and improving recovery ratio of the washing water to reduce consumption of the washing water and power.