The present invention discloses a refrigerator with a water tank (20) for supplying water to an ice tray (75A) by closing of a door. A refrigerator includes a refrigerative chamber for storing stock at a low temperature, an ice tray (75A) positioned in the refrigerative chamber and filled with water, for making ice, a water tank (20) with a water supply hole for storing water and supplying water to the ice tray, and a valve (51) for selectively opening and closing the water supply hole. In addition, a refrigerator includes a refrigerative chamber for storing stock at a low temperature, a main body for defining the refrigerative chamber, a door for opening and closing the refrigerative chamber, an ice tray (75A) positioned inside the door and filled with water, for making ice, a water tank (20) with a water supply hole for storing water and supplying water to the ice tray, and a valve (51) for selectively opening and closing the water supply hole.