A refrigerating machine oil composition comprising {HEAD ~ an alicylic dicarboxylic acid ester compound} having an alicyclic ring and two ester groups represented by {TAIL ~ formula} bonded to adjacent carbon atoms of the alicyclic ring: 
A refrigerating machine oil composition comprising { HEAD ~ an alicylic dicarboxylic acid ester compound } having an alicyclic ring and two ester groups represented by { TAIL ~ formula } bonded to adjacent carbon atoms of the alicyclic ring :
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH