The invention provides a method of inspecting a lubricating oil composition and a method of producing a lubricating oil composition. The inspecting method is capable of stably reproducing wear resistance characteristics by using a relatively easy measuring method even in the case where the lubricating oil composition contains a fullerene. In the method of inspecting the lubricating oil composition, the particle size (r) of particles present in the lubricating oil composition containing a base oil and fullerene is measured, and the lubricating oil composition is sorted on the basis of a predetermined range of the particle size (r) set by the relationship between the measured value of the particle size (r) and the measured value of the wear coefficient of the lubricating oil composition.