A refrigerating apparatus comprising: a high temperature side first cycle unit forming a high temperature side first circulation circuit in which a high temperature side first compressor, a high temperature side first condenser, a high temperature side first electronic expansion valve and a high temperature side first evaporator are connected in series by use of refrigerant pipes to circulate a first high temperature side refrigerant; a high temperature side second cycle unit forming a high temperature side second circulation circuit in which a high temperature side second compressor, a high temperature side second condenser, a high temperature side second electronic expansion valve and a high temperature side second evaporator are connected in series by use of refrigerant pipes to circulate a second high temperature side refrigerant; a low temperature side cycle unit forming a low temperature side circulation circuit comprising carbon dioxide as a low temperature refrigerant in which a low temperature side compressor, a low temperature side first condenser, a low temperature side second condenser, a low temperature side expansion unit and a low temperature side evaporator are connected in series by pipes to circulate the carbon dioxide refrigerant, wherein the compressed low temperature side refrigerant circulates first through the low temperature side first condenser and then through the low temperature side second condenser; and a first cascade condenser formed by connecting the high temperature side first evaporator and the low temperature side first condenser to each other, and configured to exchange heat between the first high temperature side refrigerant and the low temperature side refrigerant; and a second cascade condenser formed by connecting the high temperature side second evaporator and the low temperature side second condenser to each other, and configured to exchange heat between the second high temperature side refrigerant and the low temperature side refrigerant in order to condense the low temperature side refrigerant; and a control unit configured to cause the high temperature side electronic expansion valves (13A, 13B) to perform adjustment of the opening degree thereof so that the respective high temperature side refrigerant flowing out from the respective high temperature side evaporator (14A, 14B) has a required degree of superheat and to control the evaporation temperature in the high temperature side first evaporator and the high temperature side second evaporator such that the evaporation temperature in the high temperature side first evaporator becomes higher than the evaporation temperature in the high temperature side second evaporator. a high temperature side second cycle unit forming a high temperature side second circulation circuit in which a high temperature side second compressor, a high temperature side second condenser, a high temperature side second electronic expansion valve and a high temperature side second evaporator are connected in series by use of refrigerant pipes to circulate a second high temperature side refrigerant; a low temperature side cycle unit forming a low temperature side circulation circuit comprising carbon dioxide as a low temperature refrigerant in which a low temperature side compressor, a low temperature side first condenser, a low temperature side second condenser, a low temperature side expansion unit and a low temperature side evaporator are connected in series by pipes to circulate the carbon dioxide refrigerant, wherein the compressed low temperature side refrigerant circulates first through the low temperature side first condenser and then through the low temperature side second condenser; and a first cascade condenser formed by connecting the high temperature side first evaporator and the low temperature side first condenser to each other, and configured to exchange heat between the first high temperature side refrigerant and the low temperature side refrigerant; and a second cascade condenser formed by connecting the high temperature side second evaporator and the low temperature side second condenser to each other, and configured to exchange heat between the second high temperature side refrigerant and the low temperature side refrigerant in order to condense the low temperature side refrigerant; and a control unit configured to cause the high temperature side electronic expansion valves (13A, 13B) to perform adjustment of the opening degree thereof so that the respective high temperature side refrigerant flowing out from the respective high temperature side evaporator (14A, 14B) has a required degree of superheat and to control the evaporation temperature in the high temperature side first evaporator and the high temperature side second evaporator such that the evaporation temperature in the high temperature side first evaporator becomes higher than the evaporation temperature in the high temperature side second evaporator.