Refrigerating machine oil composition for a carbon dioxide refrigerant

A composition which comprises as a main component a mixture comprising:

• (A) a polyvinyl ether having a kinematic viscosity in a range of 3 to 50 mm2/s at 100° C. in an amount exceeding 40% by weight and of 99.1% by weight or less and
• (B) a polyoxyalkylene glycol having a kinematic viscosity in a range of 3 to 50 mm2/s at 100° C. in an amount of 0.1% by weight or more and less than 40% by weight,
• wherein the polyoxyalkylene glycol is a compound represented by general formula (I):
• R1—[(OR2)m—OR3]n (I)
• wherein
• R1 represents hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or an acyl group having 2 to 10 carbon atoms;
• R2 represents an alkylene group having 2 to 4 carbon atoms;
• R3 represents hydrogen atom, an alkyl group having 1 to 3 carbon atoms or an acyl group having 2 to 10 carbon atoms;
• n represents an integer of 1 to 6;
• and
• m represents numbers giving an average value of numbers represented by m×n in a range of 6 to 80.