The purpose of the present invention is to provide a lubricating oil composition to be used in internal combustion engines of passenger and commercial four-wheeled vehicles, wherein the lubricating oil composition can actualize exceptional fuel economy and wear resistance reliability. The present invention pertains to a lubricating oil composition for the internal combustion engines of four-wheeled motor vehicles, the lubricating oil composition containing a base oil and a composite polyester mixture, wherein: the base oil contains poly-alpha-olefin, ester-based base oil, and at least one type of partially hydrogenated mineral oil; the composite polyester mixture contains polyester obtained by condensing a polyhydric alcohol, a polycarboxylic acid, and a monohydric alcohol having an oxyalkylene group; the content ratio of composite polyester mixture is 0.01 mass% or more relative to the total mass of the lubricating oil composition for internal combustion engines; the 150 DEG C high-temperature shear viscosity (HTHS viscosity) of the lubricating oil composition for internal combustion engines is 1.0-2.6 mPa.s; and the NOACK evaporation level is 40% or less.