A grease composition with which low torque property, low noise property and low volatilization property can be maintained, is provided. The grease composition is characterized in that it contains: (A) an alkali metal salts and/or an alkaline earth metal salt synthesized from a hydroxide of an alkali metal or an alkaline earth metal, and a higher fatty acid having 10 or more carbon atoms or a higher hydroxyfatty acid having at least one hydroxyl group and 10 or more carbon atoms; (B) a carbonate compound represented by the general formula: (R and R′ represent a branched alkyl group having 13-15 carbon atoms, and may be same or different); and (C) at least one kind of an ester-based synthetic oil selected from the group consisting of a diester-based synthetic oil represented by the general formula (i): ROCO (CH2)nCOOR′  (i) (R and R′ represent an alkyl group having 3-18 carbon atoms, and may be the same or different, and n is 3-12); a triester-based synthetic oil represented by the general formula (ii): C2H5C(CH2OCOR)3   (ii) (R represents an alkyl group having 3-10 carbon atoms); a tetraester-based synthetic oil represented by the following general formula (iii): C (CH2OCOR)4   (iii) (R represents an alkyl group having 3-10 carbon atoms), and other neopentyl polyol ester-based synthetic oil.