A refrigerated showcase comprising: a refrigeration circuit annularly formed by connecting, to one another through a refrigerant pipe, a compressor, a condenser, a decompression device and an evaporator; a fan for blowing air to the evaporator and circulating the air; a temperature sensor for detecting temperature of the air on an upstream side of the evaporator; and a control device, wherein a predetermined value 1 for stopping operation of the compressor, a predetermined value 2 for starting the operation of the compressor and a predetermined value 3 for starting control of number of operational rotations of the compressor are stored in the control device, the control device is configured to execute the following steps: stop the operation of the compressor when detected temperature of the temperature sensor reaches the predetermined value 1 during high speed operation of the compressor in which the number of operational rotations thereof is constant, and thereafter, when the detected temperature of the temperature sensor reaches the predetermined value 2, the compressor is made to execute the high speed operation and then, when the detected temperature of the temperature sensor reaches the predetermined value 3, the number of operational rotations of the compressor is controlled, and the number of operational rotations of the compressor is reduced stepwisely, and the control device is further configured to determine whether time elapsed after the detected temperature of the temperature sensor reaches the predetermined value 1 and until the detected temperature reaches the predetermined value 2 exceeds reference time, if the elapsed time exceeds the reference time, the number of operational rotations of the compressor is controlled when the detected temperature of the temperature sensor thereafter reaches the predetermined value 3, the number of operational rotations of the compressor is stepwisely reduced, and if the elapsed time does not exceed the reference time, the high speed operation of the compressor is continued until the detected temperature of the temperature sensor thereafter reaches the predetermined value 1. a refrigeration circuit annularly formed by connecting, to one another through a refrigerant pipe, a compressor, a condenser, a decompression device and an evaporator; a fan for blowing air to the evaporator and circulating the air; a temperature sensor for detecting temperature of the air on an upstream side of the evaporator; and a control device, wherein a predetermined value 1 for stopping operation of the compressor, a predetermined value 2 for starting the operation of the compressor and a predetermined value 3 for starting control of number of operational rotations of the compressor are stored in the control device, the control device is configured to execute the following steps: stop the operation of the compressor when detected temperature of the temperature sensor reaches the predetermined value 1 during high speed operation of the compressor in which the number of operational rotations thereof is constant, and thereafter, when the detected temperature of the temperature sensor reaches the predetermined value 2, the compressor is made to execute the high speed operation and then, when the detected temperature of the temperature sensor reaches the predetermined value 3, the number of operational rotations of the compressor is controlled, and the number of operational rotations of the compressor is reduced stepwisely, and the control device is further configured to determine whether time elapsed after the detected temperature of the temperature sensor reaches the predetermined value 1 and until the detected temperature reaches the predetermined value 2 exceeds reference time, if the elapsed time exceeds the reference time, the number of operational rotations of the compressor is controlled when the detected temperature of the temperature sensor thereafter reaches the predetermined value 3, the number of operational rotations of the compressor is stepwisely reduced, and if the elapsed time does not exceed the reference time, the high speed operation of the compressor is continued until the detected temperature of the temperature sensor thereafter reaches the predetermined value 1. stop the operation of the compressor when detected temperature of the temperature sensor reaches the predetermined value 1 during high speed operation of the compressor in which the number of operational rotations thereof is constant, and thereafter, when the detected temperature of the temperature sensor reaches the predetermined value 2, the compressor is made to execute the high speed operation and then, when the detected temperature of the temperature sensor reaches the predetermined value 3, the number of operational rotations of the compressor is controlled, and the number of operational rotations of the compressor is reduced stepwisely, and the control device is further configured to determine whether time elapsed after the detected temperature of the temperature sensor reaches the predetermined value 1 and until the detected temperature reaches the predetermined value 2 exceeds reference time, if the elapsed time exceeds the reference time, the number of operational rotations of the compressor is controlled when the detected temperature of the temperature sensor thereafter reaches the predetermined value 3, the number of operational rotations of the compressor is stepwisely reduced, and if the elapsed time does not exceed the reference time, the high speed operation of the compressor is continued until the detected temperature of the temperature sensor thereafter reaches the predetermined value 1.