A charging device, which is incorporable in a process cartridge and an image forming apparatus, includes a charging roller and a cleaning device. The charging roller charges an image bearing member having a surface on which an electrostatic latent image is formed. The cleaning device cleans the charging roller. The cleaning device includes a cleaning roller, a shaft, and support members. The cleaning roller contacts the surface of the charging roller to clean the surface. The support members rotatably support the cleaning roller, each of which including a slot. The slot allows a variable distance between the charging roller and the cleaning roller, and is inclined, in the direction of rotation of the charging roller, relative to a straight line connecting the rotation center of the charging roller and the rotation center of the cleaning roller.