A refrigerator includes a body configured to be equipped with a storage, a door configured to be hinge-engaged with the body to open or close the storage, a water supply line configured to respectively supply water provided from a water source to an ice maker placed in the storage and a dispenser placed outside the door. One or more filters are configured to be engaged with the water supply line, and one or more bypass valves for respective water tanks are configured to be engaged with the water supply line at a part which is lower than an engagement point of the one or more filters. The one or more water tanks are configured to be placed inside the door and to be detachably engaged with the bypass valve for water tank.