A refrigerator including a cabinet including an insulator provided between an inner case and an outer case, a cold air duct embedded in the insulator to circulate cold air through the storage compartment, a cooling module mounting unit provided at a lower portion of the cabinet, and a cooling module including a module body in which an evaporator, a condenser, a compressor, and a cooling fan are installed and having an accommodating portion to accommodate the evaporator in a lying state, the cooling module being provided with a connection opening communicating with the cold air duct when mounted on the cooling module mounting unit.