An icemaker, comprising: a device body including an inflow portion and a discharge portion; a flow portion including an inflow opening and a discharge opening, directly or indirectly penetrating through the inflow portion and the discharge portion, respectively, and including a flow space connected to the inflow opening and the discharge opening; a cooling portion allowing a refrigerant to flow in at least a portion of a periphery of the flow portion such that water entering the flow space through the inflow opening and flowing in the flow space is cooled to be turned into ice or cold water; a separating and transferring portion separating ice made in the flow space from the flow space and transferring the ice to the discharge opening; and a supplying and storing portion connected to the inflow opening and the discharge opening to supply water to the inflow opening and to receive ice or cold water from the discharge opening, wherein the separating and transferring portion includes a screw member rotatably provided in the flow space, and the supplying and storing portion includes a pump connected to the inflow opening, the screw member is driven to discharge ice from the discharge opening and to supply ice to the supplying and storing portion, or the pump is driven to discharge cold water from the discharge opening and to supply the cold water to the supplying and storing portion, wherein the supplying and storing portion further includes a supplying and storing member having an ice storing space storing ice and a water storing space storing water, and the supplying and storing portion is positioned above the flow portion. a device body including an inflow portion and a discharge portion; a flow portion including an inflow opening and a discharge opening, directly or indirectly penetrating through the inflow portion and the discharge portion, respectively, and including a flow space connected to the inflow opening and the discharge opening; a cooling portion allowing a refrigerant to flow in at least a portion of a periphery of the flow portion such that water entering the flow space through the inflow opening and flowing in the flow space is cooled to be turned into ice or cold water; a separating and transferring portion separating ice made in the flow space from the flow space and transferring the ice to the discharge opening; and a supplying and storing portion connected to the inflow opening and the discharge opening to supply water to the inflow opening and to receive ice or cold water from the discharge opening, wherein the separating and transferring portion includes a screw member rotatably provided in the flow space, and the supplying and storing portion includes a pump connected to the inflow opening, the screw member is driven to discharge ice from the discharge opening and to supply ice to the supplying and storing portion, or the pump is driven to discharge cold water from the discharge opening and to supply the cold water to the supplying and storing portion, wherein the supplying and storing portion further includes a supplying and storing member having an ice storing space storing ice and a water storing space storing water, and the supplying and storing portion is positioned above the flow portion.