<p>A refrigeration device (10) for a container comprises: a main circuit (21); a supercooling bypass path (23) which diverges from a liquid pipe of the main circuit (21) to be connected to a compression chamber of a compressor (30) and is provided with a pressure reducing mechanism; and a supercooling heat exchanger (44) which has a primary side passage (45) connected to the liquid pipe of the main circuit (21) and a secondary side passage (46) connected to the downstream side of a supercooling expansion valve (48) of the supercooling bypass path (23). The pressure reducing mechanism is configured by the supercooling expansion valve (48) the opening degree of which can be freely adjusted. A controller (80) for controlling the opening degree of the supercooling expansion valve (48) such that the refrigerant flow rate in the supercooling bypass path (23) is adjusted according to the operating state in an operation for cooling the inside of the container is provided.</p>
