PROBLEM TO BE SOLVED: To reduce temperature difference between respective parts in a cooling chamber by providing a cold air accelerating part adjacent to a cold air outlet port in a cold air duct for accelerating cold air entering the cold air duct and discharging the cold air through the cold air outlet port. SOLUTION: Cold air generated in an evaporator 22 is supplied by an air supply fan 24, one part of cold air is supplied to a freezing chamber 10a and the other part of cold air enters a cold air duct 10c. The cold air entering the cold air duct 10c is accelerated by a cold air accelerator. That is to say, when a driving motor 32 operates to rotate a cam cylinder 34, fan plates 36 rotate to accelerate the cold air entering the cold air duct 10c toward a cold air outlet port. Accordingly, the cold air rapidly reaches an area adjacent to a door 14 in a refrigerating chamber 10b, so that the temperature difference between a part near the rear surface of the refrigerating chamber 10b and a part near the door 14 is reduced.