Dishwasher

A dishwasher comprising:

• a cabinet that defines an external appearance of the dishwasher;
• a tub that is located in the cabinet and that defines a wash space configured to receive one or more objects to be washed, the tub defining an exhaust hole at an upper surface of the tub;
• an external air flow unit that defines a flow path configured to introduce external air into a space between the tub and the cabinet and to discharge the external air to an outside of the tub, the external air flow unit defining an inflow hole located vertically above the exhaust hole and configured to communicate with the tub;
• and
• a cap that connects the tub and the external air flow unit, that is located between the exhaust hole and the inflow hole, and that is configured to block wash water sprayed from the tub,
• wherein the external air flow unit is configured to guide external air from a downstream side of the inflow hole to an upstream side of the inflow hole,
• wherein a cross-sectional area of the flow path decreases from the upstream side to the inflow hole and increases from the inflow hole to the downstream side, and
• wherein the cap comprises:
• a first cover located vertically below a center of the cap, the first cover having a circular plate shape,
• a second cover that is located at a circumference of the first cover and that extends upward, the second cover having an inclined surface that is inclined toward the center of the cap, and
• a third cover that is located at a circumference of the second cover and that extends upward, the third cover having a bent surface that is bent toward the center of the cap.