Refrigerator

An ice maker comprising:

• a first tray assembly configured to define a portion of an ice making cell that is a space in which water is phase-changed into ice by cold;
• a second tray assembly configured to define another portion of the ice making cell;
• and
• a heater disposed adjacent to at least one of the first tray assembly or the second tray assembly, and
• wherein the heater is controlled to be turned on in at least partial section while a cooler supplies the cold so that bubbles dissolved in the water within the ice making cell moves from a portion, at which the ice is made, toward the water that is in a liquid state to make transparent ice,
• wherein one tray assembly of the first and second tray assemblies comprises a tray defining at least a portion of the ice making cell and a tray case surrounding the tray, and
• wherein the tray case comprises a first portion that supports the tray and a second portion extending from a predetermined point of the first portion to reduce transfer of heat, which is transferred from the heater to the one tray assembly, to the ice making cell defined by the other tray assembly of the first and second tray assemblies.