A charging member (2) that charges an image bearing member (1) has an electrically conductive support and an elastic layer in contact with the image bearing member. The elastic layer includes a semiconductive rubber composition having a matrix-domain structure including a matrix (211) and domains (212) having electric conductivity. The matrix has a higher volume resistivity than the domain. The developer includes a toner having toner particles (T). The toner particles each have a surface layer including an organosilicon polymer. The organosilicon polymer has a structure represented by R-SiO 3/2 (R is a hydrocarbon group having at least 1 and not more than 6 carbon atoms). The adhesion ratio of the organosilicon polymer on the surface of the toner particle is 90% or more.