Process cartridge and image forming apparatus

A process cartridge configured to be attached to a main body of an image forming apparatus in a detachable manner, the image forming apparatus including an exposing unit that forms an electrostatic latent image by irradiating a pattern light, and an intermediate transfer unit onto which a toner image is transferred, the process cartridge comprising:

• a photosensitive drum that is rotatably supported;
• a charging unit that uniformly charges the photosensitive drum;
• a developing unit that develops the electrostatic latent image formed on the photosensitive drum with toner to form a toner image on the photosensitive drum;
• a cleaning unit that cleans residual toner around the photosensitive drum after transferring the toner image onto the intermediate transfer unit;
• and
• a projection at a side of the process cartridge which guides the process cartridge in a vertical direction during insertion into the image forming apparatus,
• wherein the charging unit, the developing unit, and the cleaning unit are arranged next to the photosensitive drum in an enclosure,
• the enclosure has an opening through which a developing roller of the developing unit can be seen,
• an extended line passing through a tangent line to an outer circumference of the developing roller and a wall of a first end of the enclosure in an axial direction of the developing roller does not intersect with a wall of a second end of the enclosure,
• the opening extends to a top of the enclosure, and
• a first concave portion is formed on a first surface of the enclosure extending upwards next to the opening and a second concave portion is formed on a second surface of the enclosure on a side opposite to the first surface to be used as a handle.