Patent ID: 7668484

Claim:
A charging roller, comprising a conductive support body and a resistive layer formed on the conductive support body, the resistive layer being formed by hardening a surface of a conductive agent-containing rubber layer formed by adding an electronic conductive agent and an ionic conductive agent to a rubber base material to which no conductive agents have been added forming a surface on the rubber base material comprising an electronic conductive agent and an ionic conductive agent and then molding the rubber base material, a first addition amount which is an amount of the electronic conductive agent added to the rubber base material being such that a volume resistivity when only the first addition amount of the electronic conductive agent has been added to the rubber base material is 1.46×10 6 Ω·cm or greater, and a second addition amount which is an amount of the ionic conductive agent added to the rubber base material being such that a volume resistivity when the first addition amount of the electronic conductive agent and the second addition amount of the ionic conductive agent have been added to the rubber base material is 1.93×10 6 Ω·cm or less.