The present invention provides a cleaning blade for cleaning a surface of an object to be cleaned, comprising: a contact portion that contacts the surface of the object for cleaning, the contact portion being made of a material satisfying the following inequalities (1) to (3): 3.92.ltoreq.M.ltoreq.29.42 (1); 0<.alpha..ltoreq.0.294; and (2) S.gtoreq.250 (3) wherein M denotes 100% modulus (MPa); .alpha. denotes the ratio {.DELTA.stress/.DELTA.strain degree=(stress at 200% strain degree-stress at 100% strain degree)/(200-100)} (MPa/%) of the stress alteration (.DELTA.stress) to the strain alteration (.DELTA.strain) in a range of 100% to 200% strain degree in the stress-strain curve; and S denotes the breaking elongation (%), and a cleaning apparatus, a process cartridge, and an image forming apparatus comprising the cleaning blade.