A dishwasher including a cabinet configured to form an exterior, a washing tub (803) provided in the cabinet to wash dishes, and a jet nozzle (920) configured to jet washing water to the washing tub (803), wherein the jet nozzle (920) includes a plurality of nozzle inner walls (923) provided therein to form a passage (924) through which the washing water passes and having a plurality of passage inner walls (923a) provided to have arc shapes in section vertical to a flow direction of the washing water. Due to such configuration, a jetting force may be enhanced and washing efficiency may be also improved.