Refrigerator oil and composition for refrigerators

A refrigerator oil composition consisting of a mixed refrigerant and a refrigerator oil,

• wherein the mixed refrigerant consists of from 20% to 37% by mass of an unsaturated fluorinated hydrocarbon compound (HFO) based on a total amount of the mixed refrigerant, more than 40% to less than 60% by mass of at least one selected from the group consisting of 1,1,1,2,2-pentafluoroethane (R125) and 1,1,1,2-tetmfluoroethane (R134a) on based on the total amount of the mixed refrigerant, and more than 20% to less than 40% by mass of difluoromethane (R32) based on the total amount of the mixed refrigerant,
• wherein the unsaturated fluorinated hydrocarbon compound (HFO) is at least one selected from the group consisting of 2,3,3,3-tetrafluoropropene (R1234yf) and 1,3,3,3-tetrafluoropropene (R1234ze),
• the refrigerator oil consists of a base oil (P) consisting of at least one selected from the group consisting of a polyvinyl ether (PVE) and a polyol ester (POE), wherein a hydroxy value of the base oil (P) is 15 mgKOH/g or less,
• wherein the two-layer separation temperature at the high-temperature side of the refrigerator oil is 50° C. or higher, and the two-layer separation temperature at the low-temperature side of the refrigerator oil is −20° C. or lower, and
• wherein a volume resistivity of the refrigerator oil composition is 2.0×108Ω·m or more.