Provided is an ice-maker including an upper tray made of an elastic material, and having a plurality of upper chambers defined therein, a lower tray made of an elastic material, and having a plurality of lower chambers defined therein in contact with the plurality of upper chambers to define a plurality of spherical ice chambers, respectively, each ejector-receiving opening defined in the upper tray and opened to each of the plurality of upper chambers, an upper ejector disposed above the upper tray, wherein the upper ejector is configured to pass through the ejector-receiving opening and remove each ice from each ice chamber, a water supply for supplying water for ice-making through the ejector-receiving opening, and a driver for pivoting the lower tray, wherein a side wall extending upward along a perimeter of the plurality of lower chambers is formed on top portions of the plurality of lower chambers, wherein a chamber wall extending downward along a perimeter of the plurality of upper chambers is formed on bottom portions of the plurality of upper chambers, wherein the chamber wall is inserted into an internal space of the side wall when the lower tray is closed, and wherein a groove is defined in an outer face of the chamber wall to maintain pieces of ice frozen along a perimeter of the chamber wall in an attached state.