To provide a sink capable of effectively performing boiling work while reducing a physical burden, and having no need to take out a kettle from a storage space and put away it when water is boiled.

A pump 12 is driven, and content liquid in a water tank 3 can be extracted to the outside of the water tank 3 through an extracting passage 13. Therefore, work for taking out a kettle from a storage space and putting away it can be saved when water is boiled.