A cleaning blade for use in an image-forming apparatus formed by molding a thermosetting elastomer composition containing a rubber component, a filler, a crosslinking agent, and a dispersion-improving agent. As the dispersion-improving agent, thiol or/and sulfide having a specific chemical structure are contained in the thermosetting elastomer composition at 0.05 to 15 parts by mass for 100 parts by mass of the rubber component; or fluorine-substituted benzenethiol or/and a metal salt thereof are contained in the thermosetting elastomer composition at 0.05 to 10 parts by mass for 100 parts by mass of the rubber component.