A refrigerator comprising: a cool air supplying apparatus comprising: a motor, a shaft extending in a direction of extension of a rotation axis of the motor, a first swash plate obliquely coupled to the shaft with respect to an extending direction of the shaft, a compression piston arranged on the first swash plate and configured to reciprocate in the extending direction of the shaft by rotation of the first swash plate, a compression cylinder in which a refrigerant is compressed by the compression piston, a second swash plate obliquely coupled to the shaft with respect to the extending direction of the shaft, an expansion piston arranged on the second swash plate and configured to reciprocate in the extending direction of the shaft by the rotation of the second swash plate, and an expansion cylinder in which the refrigerant is expanded by the expansion piston, the compression cylinder and the expansion cylinder are arranged to be aligned with the extending direction of the shaft, wherein the cool air supplying apparatus further comprises: a heater configured to perform heat exchange between the refrigerant, which is compressed in the compression cylinder, and outside air; a cooler configured to perform heat exchange between the refrigerant, which is expanded in the expansion cylinder, and outside air; and a regenerator configured to accumulate heat of the refrigerant passed through the heater and supply the accumulated heat to the refrigerant passed through the cooler, and with respect to the extending direction of the shaft, the heater is arranged adjacent to the compression cylinder, the cooler is arranged adjacent to the expansion cylinder, and the regenerator is arranged between the heater and the cooler. a motor, a shaft extending in a direction of extension of a rotation axis of the motor, a first swash plate obliquely coupled to the shaft with respect to an extending direction of the shaft, a compression piston arranged on the first swash plate and configured to reciprocate in the extending direction of the shaft by rotation of the first swash plate, a compression cylinder in which a refrigerant is compressed by the compression piston, a second swash plate obliquely coupled to the shaft with respect to the extending direction of the shaft, an expansion piston arranged on the second swash plate and configured to reciprocate in the extending direction of the shaft by the rotation of the second swash plate, and an expansion cylinder in which the refrigerant is expanded by the expansion piston, the compression cylinder and the expansion cylinder are arranged to be aligned with the extending direction of the shaft, wherein the cool air supplying apparatus further comprises: a heater configured to perform heat exchange between the refrigerant, which is compressed in the compression cylinder, and outside air; a cooler configured to perform heat exchange between the refrigerant, which is expanded in the expansion cylinder, and outside air; and a regenerator configured to accumulate heat of the refrigerant passed through the heater and supply the accumulated heat to the refrigerant passed through the cooler, and with respect to the extending direction of the shaft, the heater is arranged adjacent to the compression cylinder, the cooler is arranged adjacent to the expansion cylinder, and the regenerator is arranged between the heater and the cooler. a heater configured to perform heat exchange between the refrigerant, which is compressed in the compression cylinder, and outside air; a cooler configured to perform heat exchange between the refrigerant, which is expanded in the expansion cylinder, and outside air; and a regenerator configured to accumulate heat of the refrigerant passed through the heater and supply the accumulated heat to the refrigerant passed through the cooler, and with respect to the extending direction of the shaft, the heater is arranged adjacent to the compression cylinder, the cooler is arranged adjacent to the expansion cylinder, and the regenerator is arranged between the heater and the cooler.