To exert conducting performance by improving conductive grease even in application for high speed.

Each test result is put in order according to an oil film parameter Λ to thereby permit application to each condition of bearings other than the tested bearings. By using the conductive grease according to the present invention, it can be judged by the graph that the conductive performance can be improved more than is exhibited in a region of a particularly large Λ (to Λ=22, 6 in the embodiment) by the conventional conductive grease. The higher the revolution speed, the smaller the load, and the lower the temperature (the higher the lubricating grease viscosity), Λ becomes larger. That is, the conductive grease according to the present invention can be stated to be effective in a high-speed field the present invention is applied to.