A dishwasher is disclosed. The dishwasher includes a cabinet, a tub defining a washing space therein, a sump disposed under and coupled to the tub, a pump for transferring washing water stored in the sump, and a base defining a lower part of the cabinet, wherein the sump includes a sump mount, the sump mount being temporarily mounted on the base, and the base includes a first position guide, the sump mount being mounted on the first position guide so as to guide the sump to a coupling position with respect to the base.