Image forming apparatus whose image bearing member and developing device are provided in a cartridge dismountably mounted to the apparatus

An image forming apparatus comprising:

• an image bearing member on which an electrostatic image is formed;
• a developing device which develops the electrostatic image with toner, to form a toner image;
• toner replenishing device which replenishes a replenishing toner to said developing device;
• toner container which contains the replenishing toner, said toner container being dismountably mountable onto a first attachment portion provided outside a frame member of a main body of said image forming apparatus;
• a transfer device which transfers the toner image formed on said image bearing member onto a transfer medium;
• a cleaning device which collects transfer residual toner on said image bearing member;
• a transfer residual toner conveyance device which conveys the transfer residual toner collected into said cleaning device;
• a transfer residual toner container which contains the transfer residual toner conveyed by said transfer residual toner conveyance device, the transfer residual toner container being dismountably attachable with respect to a second attachment portion provided at a same side of said image forming apparatus at which the first attachment portion is provided and outside the frame member;
• and
• a drive device which provides a drive force to a cartridge, said drive device being provided outside the frame member and at an opposite side at which the first attachment portion and the second attachment portion are provided,
• wherein at least said image bearing member, said developing device and said cleaning device are provided in the cartridge which is dismountably mountable onto a third attachment portion provided inside the frame member of the main body of said image forming apparatus.