A cleaning blade, having an elastic body formed of a rubber base material molded product, and a surface treatment layer on at least an area of the elastic body to be brought into contact with a cleaning object, wherein: the surface treatment layer is formed by impregnating a surface portion of the elastic body with a surface treatment liquid containing an isocyanate compound and an organic solvent, and hardening the liquid; the surface treatment liquid concentration of the surface treatment layer has such a profile that the impregnation concentration gradually decreases from the surface toward the depth direction; the surface treatment layer has an elastic modulus of 60 MPa or lower; the elastic body has an elastic modulus of 3 MPa to 35 MPa; the difference in elastic modulus between the surface treatment layer and the elastic body is 1 MPa to 25 MPa; and index M, which is calculated from a breaking elongation,in %, of the elastic body at 23°C, a 1-Hz tanδ peak temperature,in °C, of the elastic body, and an impregnation depth,in μm, of the surface treatment liquid by the following formula: index M = breaking elongation, in %, of the elastic body at 23 ° C × 1 − Hz tan δ peak temperature, in ° C × − 1 / impregnation depth, in μ m, of surface treatment liquid is 1 to 1,100; wherein the elastic modulus of the surface treatment layer and that of the rubber elastic body are indentation elastic modulus values as determined according to ISO 14577, the breaking elongation of the elastic body at 23°C is determined at 23°C in accordance with JIS K6251, 2010, the 1-Hz tanδ peak temperature is measured by means of a DMS viscoelastic spectrometer at 1 Hz in a thermogravimetric analyzer EXSTAR 6000, product of SEIKO Instruments Inc., and the surface treatment liquid impregnation depth is measured by means of Dynamic Ultra Micro Hardness Tester DUH-201, product of Shimadzu Corporation, according to JIS Z2255 and ISO 14577. the surface treatment layer is formed by impregnating a surface portion of the elastic body with a surface treatment liquid containing an isocyanate compound and an organic solvent, and hardening the liquid; the surface treatment liquid concentration of the surface treatment layer has such a profile that the impregnation concentration gradually decreases from the surface toward the depth direction; the surface treatment layer has an elastic modulus of 60 MPa or lower; the elastic body has an elastic modulus of 3 MPa to 35 MPa; the difference in elastic modulus between the surface treatment layer and the elastic body is 1 MPa to 25 MPa; and index M, which is calculated from a breaking elongation,in %, of the elastic body at 23°C, a 1-Hz tanδ peak temperature,in °C, of the elastic body, and an impregnation depth,in μm, of the surface treatment liquid by the following formula: index M = breaking elongation, in %, of the elastic body at 23 ° C × 1 − Hz tan δ peak temperature, in ° C × − 1 / impregnation depth, in μ m, of surface treatment liquid is 1 to 1,100; wherein the elastic modulus of the surface treatment layer and that of the rubber elastic body are indentation elastic modulus values as determined according to ISO 14577, the breaking elongation of the elastic body at 23°C is determined at 23°C in accordance with JIS K6251, 2010, the 1-Hz tanδ peak temperature is measured by means of a DMS viscoelastic spectrometer at 1 Hz in a thermogravimetric analyzer EXSTAR 6000, product of SEIKO Instruments Inc., and the surface treatment liquid impregnation depth is measured by means of Dynamic Ultra Micro Hardness Tester DUH-201, product of Shimadzu Corporation, according to JIS Z2255 and ISO 14577.