Dish washer

A dishwasher comprising:

• a sump configured to store water;
• a pair of main arms disposed at the sump and configured to extend in opposite directions to supply water from the sump to spray wash water to an object;
• a pair of auxiliary arm connection members configured to extend in opposite directions and to be spaced apart from the main arms by a predetermined angle;
• and
• a pair of auxiliary arms rotatably disposed at the auxiliary arm connection members and configured to spray wash water to the object while rotating about a rotation axis that is defined by a direction in which the auxiliary arms extend, forming an auxiliary flow passage in which wash water flows,
• wherein the pair of main arms include a transfer flow passage in fluid communication with the auxiliary flow passage,
• wherein each of the pair of auxiliary arm connection members comprise:
• a flow tube integral with the pair of main arms in fluid communication with the transfer flow passage and the auxiliary flow passage;
• a first support rib disposed at a first side of the flow tube and configured to extend in a longitudinal direction of the flow tube;
• a second support rib disposed at a second side of the flow tube and parallel to the first support rib;
• a third support rib connected to the first support rib and the second support rib;
• and
• a shaft connected to the third support rib and configured to be inserted into the auxiliary flow passage.