Disclosed herein is a dish washing machine including a sump unit capable of supplying, to an injection nozzle, wash water flowing in accordance with operation of an impeller, without using a separate channel member. The dish washing machine includes a body provided with a washing tub, a sump unit arranged in the washing tub, and at least one injection nozzle to inject wash water into the washing tub. The sump unit includes a sump housing, an impeller arranged in the sump housing, to pump wash water from the sump housing, and a guide member, to which the sump housing is mounted. The guide member guides the wash water pumped by the impeller directly to the injection nozzle.