| abstract |
Provided are: a grease composition having superior fretting resistance in a wide temperature region from low temperatures to high temperatures, particularly in low temperatures; and a rolling bearing encapsulating the grease composition. The grease-encapsulating bearing (1) is formed by encapsulating the grease composition (7); the grease composition (7) contains a base oil, a thickening agent, and an additive agent; the additive agent contains at least one phosphite ester represented by formula (1) or (2); and the amount of the phosphite ester contained is 0.5-4 parts by weight for every 100 parts by weight of the total of the base oil and the thickening agent. (In formulas (1) and (2), R 1 , R 2 , R 3 , R 4 , and R 5 each are a methyl group or an ethyl group. Also, R 1 and R 2 as well as R 3 , R 4 , and R 5 may be the same group or a different group.) |