Refrigerator

An ice maker comprising:

• a first tray assembly configured to define a first portion of a cell that is a space in which liquid is phase-changed into ice;
• and
• a second tray assembly configured to define a second portion of the cell,
• wherein the first tray assembly comprises:
• a first tray part configured to define an appearance of at least a portion of the first tray assembly,
• a second tray part formed of a material different from that of the first tray part and defining the first portion of the cell, wherein the first tray part includes a portion having a greater degree of deformation resistance than that of the second tray part, and
• a third tray part in contact with the first tray part.