Triurea grease compositions having excellent oil separation, shear. stability, oxidation stability and structural stability at a high temperature, which contain a triurea compound
wherein R, is a monovalent aliphatic hydrocarbon radical having 12-24 carbon atoms, R 2 is a divalent triazine derivative radical, R 3 is a divalent aromatic hydrocarbon radical having 6-15 carbon atoms or the derivative radical thereof, and R 4 is at least one of monovalent aliphatic hydrocarbon radicals having 2-24 carbon atoms, derivative radicals thereof, monovalent aromatic hydrocarbon radicals having 6-10 carbon atoms and derivative radicals thereof, as a thickening agent in a usual lubricating base oil.