Working fluid composition for refrigerator, and refrigerator oil

A working fluid composition for a refrigerating machine, comprising:

• a refrigerant comprising trifluoroiodomethane difluoromethane (R32), and pentafluoroethane (R125), wherein a content of the trifluoroiodomethane is 30% by mass or more and 50% by mass or less based on the total amount of the refrigerant;
• and
• a refrigerating machine oil comprising a complex ester synthesized from
• a polyhydric alcohol selected from neopentyl glycol and trimethylolpropane,
• a polybasic acid selected from adipic acid and sebacic acid, and
• at least one selected from
• a monohydric alcohol having 8 to 10 carbon atoms, and
• a monocarboxylic fatty acid having 8 to 10 carbon atoms;
• wherein the refrigerating machine oil further comprises a polyol ester of a polyhydric alcohol and a fatty acid, wherein the polyhydric alcohol is pentaerythritol, dipentaerythritol, or a mixed alcohol of pentaerythritol and dipentaerythritol, and wherein the fatty acid is a saturated fatty acid having 4 to 9 carbon atoms, and
• wherein a content of the complex ester is 15% by mass or more, and a content of the polyol ester is 60% by mass or more based on the total amount of the refrigerating machine oil.