Disclosed herein is a container refrigeration apparatus (10) including an exterior fan (25) and a gas supply device (30). The gas supply device (30) includes a unit case (70) having a cooling air inlet port (79a) and a cooling air outlet port (79b), and a pump mechanism (31P) housed in the unit case (70) and configured to suck, and compress, outside air. The container refrigeration apparatus (10) has an exhaust passage (85) through which the unit case (70) and a space on a suction side of the exterior fan (25) are connected together such that the exterior fan (25) sucks air through the cooling air outlet port (79b) out of the unit case (70). As a result, the problem of heat generated by the gas supply device including the pump mechanism may be solved at low cost.