Provided is a refrigerator including a cabinet having a refrigerating compartment and a freezing compartment defined therein, and an ice-maker disposed in the freezing compartment, wherein the ice-maker includes a cold-air hole for receiving cold air, an upper tray having a plurality of hemispherical upper chambers defined therein, a lower tray pivotably disposed below the upper tray, wherein the lower tray has a plurality of lower chambers defined therein respectively connected to the upper chambers by pivoting, wherein each of the lower chambers and each of the upper chambers connected with each other define an ice chamber for forming spherical ice therein, a driver for pivoting the lower tray, and at least one shield formed on an outer face of the upper tray and corresponding to at least one of the ice chambers respectively, thereby to reduce the cold-air from invading the at least one corresponding ice chamber.