An ice maker of the present embodiment comprises: an upper tray including an upper tray body defining an upper chamber that is a portion of an ice chamber for generating ice; and a lower tray rotated relative to the upper tray based on a rotational center, and including a lower tray body defining a lower chamber that is another portion of the ice chamber, wherein a top surface of the lower tray body can contact a bottom surface of the upper tray body, the rotational center is disposed outside of the upper chamber and the lower chamber, the bottom surface of the upper tray body includes a first surface and a second surface disposed farther from the rotational center than the first surface, and before the top surface of the lower tray body contacts the bottom surface of the upper tray body, the second surface is lower than the first surface.