A refrigerator of the present invention comprises: storage chambers for storing food; a cooler for supplying cold to the storage chambers; a first tray
assembly for forming a portion of an ice-making
cell, which is the space in which water phase-changes into ice by the cold; a second tray
assembly for forming another portion of the ice-making
cell; a heater positioned adjacently to the first tray
assembly and / or the second tray assembly; and a
control unit for controlling the heater, wherein the
control unit turns on the heater in at least a portion of a section while the cooler supplies cold, so that bubbles dissolved in the water inside the ice-making
cell move toward
liquid water from a portion in which ice is formed, thereby enabling
clear ice to be formed, and the
control unit increases the heating rate of the heater when the
heat transfer rate between the cold inside the storage chambers and the water of the ice-making cell is increased, and reduces the heating rate of the heater when the
heat transfer rate between the cold inside the storage chambers and the water of the ice-making cell is reduced, so that the ice-making speed of the water inside the ice-making cell can be maintained within a predetermined range that is lower than the ice-making speed when ice making is performed while the heater is turned off.