The present invention relates to a refrigerator and an ice maker thereof, and more particularly, to an ice maker provided in a refrigerating chamber of a refrigerator. An ice maker according to the present invention comprises a tray for storing a drinkable water to be used for making ice, an ejector for separating ice formed in the tray, an ice-making pipe provided in the tray, and a heating member provided in the tray. According to a refrigerator and an ice maker thereof according to the present invention, there is no need for forming an additional duct to supply cold air to the ice maker in order to make ice, whereby it is possible to simplify a manufacturing process of a refrigerator and to reduce manufacturing costs of a refrigerator.