A refrigerator comprising: a first tray configured to define one portion of an ice making cell that is a space in which water is phase-changed into ice by cold air supplied by a cold air supply part; and a second tray configured to define the other portion of the ice making cell; the refrigerator comprising: a water supply valve configured to adjust a flow of water supplied to the ice making cell; a water supply amount detection part configured to detect a water supply amount to the ice making cell; and a controller configured to control the water supply valve, wherein the controller controls the water supply valve so that the water as much as a first reference water supply amount is supplied to the ice making cell so as to supply water to the ice making cell at a water supply position of the second tray, wherein the controller controls the second tray to move to an ice making position after a supply of water as much as the first reference water supply amount is completed and determines whether the water supply amount to the ice making cell reaches a target water supply amount, by using the water supply amount detection part, wherein the controller controls so that an ice making starts when the water supply amount to the ice making cell reaches the target water supply amount, and wherein the controller controls the water supply valve to supply the water as much as a second reference water supply amount less than the first reference water supply amount after the second tray moves again to the water supply position when the water supply amount to the ice making cell does not reach the target water supply amount. a first tray configured to define one portion of an ice making cell that is a space in which water is phase-changed into ice by cold air supplied by a cold air supply part; and a second tray configured to define the other portion of the ice making cell; the refrigerator comprising: a water supply valve configured to adjust a flow of water supplied to the ice making cell; a water supply amount detection part configured to detect a water supply amount to the ice making cell; and a controller configured to control the water supply valve, wherein the controller controls the water supply valve so that the water as much as a first reference water supply amount is supplied to the ice making cell so as to supply water to the ice making cell at a water supply position of the second tray, wherein the controller controls the second tray to move to an ice making position after a supply of water as much as the first reference water supply amount is completed and determines whether the water supply amount to the ice making cell reaches a target water supply amount, by using the water supply amount detection part, wherein the controller controls so that an ice making starts when the water supply amount to the ice making cell reaches the target water supply amount, and wherein the controller controls the water supply valve to supply the water as much as a second reference water supply amount less than the first reference water supply amount after the second tray moves again to the water supply position when the water supply amount to the ice making cell does not reach the target water supply amount. a water supply valve configured to adjust a flow of water supplied to the ice making cell; a water supply amount detection part configured to detect a water supply amount to the ice making cell; and a controller configured to control the water supply valve, wherein the controller controls the water supply valve so that the water as much as a first reference water supply amount is supplied to the ice making cell so as to supply water to the ice making cell at a water supply position of the second tray, wherein the controller controls the second tray to move to an ice making position after a supply of water as much as the first reference water supply amount is completed and determines whether the water supply amount to the ice making cell reaches a target water supply amount, by using the water supply amount detection part, wherein the controller controls so that an ice making starts when the water supply amount to the ice making cell reaches the target water supply amount, and wherein the controller controls the water supply valve to supply the water as much as a second reference water supply amount less than the first reference water supply amount after the second tray moves again to the water supply position when the water supply amount to the ice making cell does not reach the target water supply amount.