This invention relates to a cleaning unit including a cleaning blade that
keeps a front end of rubber material in contact with the surface with a
pressure so as to scrape residual toner left on the surface of the
photoreceptor and a fiber body having multiple fibers in contact with the
surface of the photoreceptor in the upstream in the cyclic moving
direction of the surface of the photoreceptor with respect to the
cleaning blade, the cleaning blade satisfying A.gtoreq.-2.5.times.B+102
and 6.3.ltoreq.B.ltoreq.19.6, where A designates a contact angle
(.degree.) with pure water under 23.degree. C., 55% RH and B designates
100% modulus (MPa) at 23.degree. C.