Refrigerating machine oil composition

A refrigerating oil composition comprising

• a refrigerant (A) containing as a predominant component a C1-C8 hydrocarbon compound and
• a base oil (B) composed of a polyalkylene glycol ether represented by formula (I):
• wherein each of R1 and R2 represents a hydrogen atom, a C1-C18 hydrocarbon group, or a C2-C18 acyl group, provided that R1 and R2 are not simultaneously hydrogen atoms;
• each of m and n is an integer of 1 or more;
• and n/(m+n) is more than 0.4, and/or a polyvinyl ether represented by formula (II):
• wherein each of R3 and R4 represents a hydrogen atom, a C1-C18 hydrocarbon group, or a C2-C18 acyl group;
• R5 represents a C1-C4 hydrocarbon group;
• R6 represents a C2-C4 hydrocarbon group, provided that the number of carbon atoms contained in R6 is greater than that of carbon atoms contained in R5;
• p is an integer of 1 or more;
• and q is an integer of 0 or more,
• and satisfying the following conditions:
• (i) solubility of the refrigerant (A) in the base oil (B) is 40 mass % or less at 40° C. and 1.2 MPa and
• (ii) mixture viscosity of the refrigerating oil composition is 0.1 mm2/S or more at 90° C. and 2.3 MPa.