Refrigerant composition containing fluorohydrocarbon-containing refrigerant and capable of improving sliding properties, oligomer, and composition containing oligomer

Provided is a refrigerant composition which contains a fluorinated hydrocarbon-containing refrigerant and is capable of improving the sliding properties of a sliding part of a vapor compression refrigerator. The present invention specifically provides a refrigerant composition containing a fluorinated hydrocarbon-containing refrigerant and an oligomer, the oligomer being a polymer of a halogenated hydrocarbon, (1) the fluorinated hydrocarbon containing fluoroethylene, (2) the oligomer being at least one of an oligomer A having a molecular weight of 200-900 and an oligomer B having a molecular weight of 200-900, and (3) the oligomer being at least one of an oligomer A having a molecular weight of 200-900 and an oligomer B having a molecular weight of 200-900. The oligomer A is a polymer of a halogenated hydrocarbon A represented by C2HaFbClc (wherein a + b + c = 4, a = an integer of 0-3, b = an integer of 1-4, and c = an integer of 0-1), and the oligomer B is a polymer of a halogenated hydrocarbon B represente