A refrigeration apparatus, comprising: a refrigerant circuit , a refrigerant circulating in the refrigerant circuit by a compressor to perform a refrigeration cycle, wherein, as refrigerant of the refrigerant circuit , refrigerant represented by Molecular Formula 1: C 3 H m F n where "m" and "n" are integers equal to or greater than 1 and equal to or less than 5, and a relationship represented by an expression m + n = 6 is satisfied, and having a single double bond in a molecular structure, or refrigerant mixture containing the refrigerant is used, predetermined functional resin components arranged so as to contact the refrigerant of the refrigerant circuit are made of any of polytetrafluoroethylene, polyphenylene sulfide, phenolic resin, polyamide resin, chloroprene rubber, silicone rubber, hydrogenated nitrile rubber, fluorine-containing rubber, and hydrin rubber, in the compressor , refrigerant oil is used, which has a saturated water amount of equal to or greater than 2000 ppm at a temperature of 30°C and a relative humidity of 90%, the refrigerant oil mainly contains polyalkylene glycol, the refrigerant oil has surface tension of equal to or greater than 0.02 N/m and equal to or less than 0.04 N/m at 20°C, and the polyalkylene glycol has a molecular structure represented by Molecular Formula 2: R1(R2) m (R30) n R4 where "m" and "n" are integers, symbols "R1" and "R4" represent an alkyl or aryl group having the hydrogen or carbon number of equal to or greater than 1 and equal to or less than 6, and symbols "R2" and "R30" represent an alkyl group having the carbon number of equal to or greater than 1 and equal to or less than 4. a refrigerant circuit , a refrigerant circulating in the refrigerant circuit by a compressor to perform a refrigeration cycle, wherein, as refrigerant of the refrigerant circuit , refrigerant represented by Molecular Formula 1: C 3 H m F n where "m" and "n" are integers equal to or greater than 1 and equal to or less than 5, and a relationship represented by an expression m + n = 6 is satisfied, and having a single double bond in a molecular structure, or refrigerant mixture containing the refrigerant is used, predetermined functional resin components arranged so as to contact the refrigerant of the refrigerant circuit are made of any of polytetrafluoroethylene, polyphenylene sulfide, phenolic resin, polyamide resin, chloroprene rubber, silicone rubber, hydrogenated nitrile rubber, fluorine-containing rubber, and hydrin rubber, in the compressor , refrigerant oil is used, which has a saturated water amount of equal to or greater than 2000 ppm at a temperature of 30°C and a relative humidity of 90%, the refrigerant oil mainly contains polyalkylene glycol, the refrigerant oil has surface tension of equal to or greater than 0.02 N/m and equal to or less than 0.04 N/m at 20°C, and the polyalkylene glycol has a molecular structure represented by Molecular Formula 2: R1(R2) m (R30) n R4 where "m" and "n" are integers, symbols "R1" and "R4" represent an alkyl or aryl group having the hydrogen or carbon number of equal to or greater than 1 and equal to or less than 6, and symbols "R2" and "R30" represent an alkyl group having the carbon number of equal to or greater than 1 and equal to or less than 4. <EOS>