Provided is an ice maker including an upper tray (150) and a lower tray made of an elastic material, wherein a plurality of upper chambers defined in the upper tray and a plurality of lower chambers defined in the lower tray are in contact with each other to define a plurality of spherical ice chambers, respectively, an ejector-receiving opening (154) is opened to each of the plurality of upper chambers, an opening-defining wall (155) extending upward along a circumference of each ejector-receiving opening, an upper ejector configured to pass through the ejector-defining wall and vertically move to remove each ice from each ice chamber, and a driver for pivoting the lower tray to open and close the upper tray and the lower tray, wherein the upper tray includes a horizontal extension (164) forming a top face of the upper tray, wherein the upper chamber is positioned below the horizontal extension such that the opening-defining wall is formed at a vertical level equal to or lower than a vertical level of the opening-defining wall.
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