A refrigerator comprising: a body; a storage compartment provided inside of the body to have an opened front surface; an evaporator provided in a rear side of the storage compartment to generate cool air; a defrost heater provided in a lower side of the evaporator; a lower cool air duct having a first flow path configured to guide cool air generated by the evaporator to a lower portion of the rear side of the storage compartment; an upper cool air duct disposed above the lower cool air duct, the upper cool air duct including a second flow path configured to guide cool air generated by the evaporator, the second flow path having an outlet through which air is discharged to an upper portion of the rear side of the storage compartment; a blower fan configured to guide cool air to the first flow path and the second flow path; a first cool pack in which storage material is filled, and a second cool pack mounted to an upper portion of an inside of the storage compartment, wherein the second cool pack, in which storage material is filled, is configured to store cold storage energy from cool air passing through the second flow path and discharged via the outlet, characterized in that the first cool pack is disposed in the upper cool air duct, wherein the first cool pack is configured to store cold storage energy from cool air passing through the second flow path of the upper cool air duct to decrease a temperature of air passing via the second flow path of the upper cool air duct while the defrost heater is being operated, so that increase in an internal temperature of the storage compartment due to heat from the defrost heater is delayed. a body; a storage compartment provided inside of the body to have an opened front surface; an evaporator provided in a rear side of the storage compartment to generate cool air; a defrost heater provided in a lower side of the evaporator; a lower cool air duct having a first flow path configured to guide cool air generated by the evaporator to a lower portion of the rear side of the storage compartment; an upper cool air duct disposed above the lower cool air duct, the upper cool air duct including a second flow path configured to guide cool air generated by the evaporator, the second flow path having an outlet through which air is discharged to an upper portion of the rear side of the storage compartment; a blower fan configured to guide cool air to the first flow path and the second flow path; a first cool pack in which storage material is filled, and a second cool pack mounted to an upper portion of an inside of the storage compartment, wherein the second cool pack, in which storage material is filled, is configured to store cold storage energy from cool air passing through the second flow path and discharged via the outlet, characterized in that the first cool pack is disposed in the upper cool air duct, wherein the first cool pack is configured to store cold storage energy from cool air passing through the second flow path of the upper cool air duct to decrease a temperature of air passing via the second flow path of the upper cool air duct while the defrost heater is being operated, so that increase in an internal temperature of the storage compartment due to heat from the defrost heater is delayed.