To put a valve element into close contact with a drain port to prevent a water leak, even if food wastes are attached to the surface of the valve element, by providing an elastic member on the surface of the drain port of a selector valve.

A dish washer washes dishes and drains water by one pump. When a process is changed from a washing process to a draining process, a valve element 105 in a pump needs to be turned to switch a circulation water discharging port. A casing 101 has a washing water discharging port 102 and a drain port 103. An elastic member 106 is fitted in a groove at the discharge side of the valve element 105. The valve element 105 is turned around a shaft 107. Even if a gap between the valve element 105 and a drain port 103 is clogged with small food wastes included in the circulation water during washing, the valve element 105 is put into close contact with the drain port 103 by the elastic member 106 to prevent the circulation water from leaking from the drain port 103 while washing dishes. This simplifies a water leak prevention structure and reduces costs.