Dishwasher

A dishwasher comprising:

• a spray module which sprays washing water toward dishes;
• a sump which supplies washing water to the spray module;
• a pump which pumps the washing water stored in the sump to the spray module;
• and
• an air jet generator which receives a part of the washing water stored in the sump and forms an air bubble in the washing water;
• and
• a high pressure pump that pumps the washing water of the sump to the air jet generator,
• wherein the air jet generator comprises:
• an impeller which applies centrifugal force to the washing water that flows;
• a decompression portion providing a cross-sectional area that reduces in a water flowing direction and that decreases a pressure of the washing water that passed through the impeller;
• an air suction portion that is disposed at an end of the decompression portion and that provides an opening to allow air to flow into the decompression portion;
• a pressing portion providing a cross-sectional area that increases in the water flowing direction and that increases pressure so as to crush the air introduced from the air suction portion;
• an air tap which has a plurality of holes formed therein so as to crush the air contained in washing water that passed through the pressing portion;
• and
• an air tap mounting portion providing a cross-sectional area that extends in constant size from an end of the pressing portion and mounts the air tap,
• wherein the air tap is disposed and spaced apart from the end of the pressing portion at a predetermined interval, and
• wherein a reduction ratio of the cross-sectional area of the decompression portion is less than an increment ratio of the cross-sectional area of the pressing portion.