Grease composition

The invention provides a grease composition containing a urea thickener represented by formula (1): R1 -NHCONH-R2 -NHCONH-R 3 (1) (wherein R2 is a bivalent aromatic hydrocarbon group having 6 to 15 carbon atoms; and R 1 and R 3 , which may be the same or different from each other, represent an alkyl group having 8 to 22 carbon atoms, cyclohexyl group or an aryl group having 6 to 12 carbon atoms); and a base oil containing at least one compound represented by formula (3): (wherein R6 and R7 , which may be the same or different from each other, represent a branched alkyl group having 10 to 26 carbon atoms, with the ratio of the number of moles of the alkyl groups represented by R6 and R7 where the carbon atom attached to the phenyl ring is a quaternary carbon atom being 40 to 95 mol% with respect to the total number of moles of the branched alkyl groups; and m and n are real numbers of 0 or more so as to satisfy the condition of 1.0