PURPOSE: To obtain a refrigerating cycle controller by which misjudgement at the time of checking the refrigerant filling amount is avoided and refrigerant is prevented from being excessively filled.

CONSTITUTION: A refrigerating cycle controller includes a pressure sensor 6 which detects the refrigerant pressure at a suction side 1a of a compressor 1, a switch 7 which is manipulated when checking refrigerant, a bypass pipe 8 which bypasses a liquid receiver 3, a normal-closed solenoid valve 9 which opens and closes the bypass pipe 8, a sight glass 10 mounted on the bypass pipe 8, and an electronic controller 20. When the refrigerant pressures detected by the pressure sensor 6 are not lower than the pressure equivalent to the two-layer separating temperature after the switch 7 is manipulated, at least either a fan 2a of a condenser 2 or a fan 5a of an evaporator 5 is varied in rotating speed so that the refrigerant temperature tends to decrease, and when the detected refrigerant pressure is lower than the pressure equivalent to the two-layer separation temperature, the solenoid valve 9 is opened. Thereby, non-turbid refrigerant can between through the sight glass 10.