Dishwasher

A dishwasher comprising:

• a tub that defines a cleaning space;
• a first rack positioned in the tub and configured to receive objects therein and a second rack provided under the first rack;
• a spray arm positioned under the second rack and configured to spray water;
• a tower nozzle fastened to the second rack and configured to spray water toward the first rack;
• a tower connector including an arm securing body that passes through the spray arm, and a tower body that is projected from the arm securing body and configured to supply water to the tower nozzle based on water being introduced to the arm securing body;
• a spray arm supporter including a supporter body configured to support the spray arm and having the arm securing body fastened thereto, a chamber in the supporter body that receives water, an arm supply hole in the chamber that supplies water to the spray arm, and a tower supply hole in the chamber that supplies water to the arm securing body;
• and
• a flow passage change over unit provided in the chamber and configured to open either the arm supply hole or the tower supply hole depending on a pressure of water in the chamber.