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