To provide a conductive grease composition having excellent electrical conductivity and causing little lowering of conductivity with time and to provide a rolling device having low electric resistance to prevent the charge accumulation for a long period and having excellent noise performance and torque performance.

A conductive grease composition 27 containing a base oil, a thickening agent and a conductivity imparting additive is sealed in a cavity of a deep-groove ball bearing 21. The conductivity imparting additive is a conductive polymer soluble in the base oil and the amount of the conductivity imparting additive is preferably 0.1 mass% and 10 mass% based on the total conductive grease composition 27.