A lubricating oil composition, which comprises a perfluoropolyether base oil, and a fluorine-containing polyether diphosphonic acid ester, represented by the following general formula :

        (R 2 O)(R 1 O)P(O)(CH 2 ) a CF(CF 3 )[OCF 2 CF(CF 3 )] b O(CF 2 ) c O[CF(CF 3 )CF 2 O] d CF(CF 3 )(CH 2 ) e P(O)(OR 3 )(OR 4 )

(where R 1 , R 2 , R 3 , and R 4 are hydrogen atoms, alkyl groups, cycloalkyl groups, aryl groups, alkylaryl groups, aralkyl groups, or any of the foregoing groups can be halogen atom-substituted groups, subscripts a, b, c, d, and e are in conditions of 2≦a+e≦8, b+d≦28, and 1≦c≦10, and b and d can be 0), and a grease composition which further contains a thickening agent in addition to the lubricating oil composition, have distinguished abrasion resistance and rust preventiveness without deteriorating the heat resistance inherent in the lubricating oil and the grease containing a perfluoropolyether oil as a base oil.