A refrigerating device comprising: (a) a refrigerant circuit including a compressor which compresses a refrigerant and an expansion valve (36, 23) in which an opening degree (Op) is adjustable; (b) a temperature detecting section detecting a discharge pipe temperature of the refrigerant which is discharged from the compressor outside the compressor; (c) an outside air temperature sensor measuring an outside air temperature (To); a protection control section performing protection control for the compressor characterised in that the protection control section performs three types of protection control according to the value of the discharge pipe temperature (Tt) and first to third determination temperatures (T1, T2, T3) having a relation where the first determination temperature is smaller than the second determination temperature and where the second determination temperature is smaller than the third determination temperature, wherein a first protection control is performed in which a driving frequency of the compressor is reduced in a case where the first determination temperature is smaller than the discharge pipe temperature (Tt) and the the discharge pipe temperature (Tt) is smaller than or equal to the second determination temperature, and/or a second protection control is performed where the opening degree (Op) of the expansion valve (36, 23) is increased in a case where the second determination temperature is smaller than the discharge pipe temperature (Tt) and the discharge pipe temperature (Tt) is smaller than or equal to the third determination temperature, and/or and/or a third protection control is performed where the compressor is stopped in a case where the discharge pipe temperature (Tt) exceeds the third determination temperature; and a determination temperature modifying section modifying the combination of the first to third determination temperatures (T1, T2, T3) according to information on the outside air temperature (To) and/or information on a type of the refrigerant. (a) a refrigerant circuit including a compressor which compresses a refrigerant and an expansion valve (36, 23) in which an opening degree (Op) is adjustable; (b) a temperature detecting section detecting a discharge pipe temperature of the refrigerant which is discharged from the compressor outside the compressor; (c) an outside air temperature sensor measuring an outside air temperature (To); a protection control section performing protection control for the compressor characterised in that the protection control section performs three types of protection control according to the value of the discharge pipe temperature (Tt) and first to third determination temperatures (T1, T2, T3) having a relation where the first determination temperature is smaller than the second determination temperature and where the second determination temperature is smaller than the third determination temperature, wherein a first protection control is performed in which a driving frequency of the compressor is reduced in a case where the first determination temperature is smaller than the discharge pipe temperature (Tt) and the the discharge pipe temperature (Tt) is smaller than or equal to the second determination temperature, and/or a second protection control is performed where the opening degree (Op) of the expansion valve (36, 23) is increased in a case where the second determination temperature is smaller than the discharge pipe temperature (Tt) and the discharge pipe temperature (Tt) is smaller than or equal to the third determination temperature, and/or and/or a third protection control is performed where the compressor is stopped in a case where the discharge pipe temperature (Tt) exceeds the third determination temperature; and a determination temperature modifying section modifying the combination of the first to third determination temperatures (T1, T2, T3) according to information on the outside air temperature (To) and/or information on a type of the refrigerant. a first protection control is performed in which a driving frequency of the compressor is reduced in a case where the first determination temperature is smaller than the discharge pipe temperature (Tt) and the the discharge pipe temperature (Tt) is smaller than or equal to the second determination temperature, and/or a second protection control is performed where the opening degree (Op) of the expansion valve (36, 23) is increased in a case where the second determination temperature is smaller than the discharge pipe temperature (Tt) and the discharge pipe temperature (Tt) is smaller than or equal to the third determination temperature, and/or and/or a third protection control is performed where the compressor is stopped in a case where the discharge pipe temperature (Tt) exceeds the third determination temperature; and