Ice maker and refrigerator including the same

A refrigerator comprising:

• a cabinet that defines a refrigerating compartment;
• a refrigerating compartment door configured to open and close at least a portion of the refrigerating compartment;
• an ice maker located at the refrigerating compartment door and configured to generate ice, the ice maker comprising an ice tray configured to receive water;
• and
• a cool air guide located vertically below the ice maker and configured to supply cool air to the ice maker, the cool air guide comprising:
• a body located below a lower portion of the ice tray,
• a cool air inlet located at a side of the body and configured to receive cool air, and
• an opening portion defined at an upper side of the body facing the lower portion of the ice tray,
• wherein the ice maker further includes:
• an ejector that is configured to rotate with respect to the ice tray, that is configured to cause rotation of ice pieces with respect to the ice tray, and that is configured to discharge the ice pieces from the ice tray, and
• a motor configured to drive the ejector to rotate relative to the ice tray, wherein the lower portion of the ice tray includes:
• a plurality of first guide ribs that are located above a lower end of a side surface of the ice tray, that face the opening portion, and that extend in a first direction, and
• a plurality of second guide ribs that extend below the lower end of the side surface of the ice tray, that protrude downward from the lower portion of the ice tray toward the opening portion, and that extend in a second direction transverse to the first direction,
• wherein the cool air guide is configured to supply cool air in the second direction,
• wherein the ice tray defines, at the lower portion of the ice tray, a first area that includes a first portion of the plurality of first guide ribs, and a second area that includes a second portion of the plurality of first guide ribs and the plurality of second guide ribs,
• wherein a number of the second guide ribs in the first area of the ice tray is less than a number of the second guide ribs in the second area of the ice tray, and
• wherein the first area of the ice tray is arranged next to the second area and located closer to the cool air inlet than the second area.