An image forming apparatus comprising: a developing structure that includes a process cartridge which houses a developing unit (126K, 126C, 126M, and 126Y) that develops an image by using toner; and a toner supply unit that is provided between the toner tank (T1 to T4) and the developing unit (126K, 126C, 126M and 126Y) and which includes a toner tank (T1 to T4), which toner tank (T1 to T4) is configured to contain toner and characterized by: a toner supply member that supplies toner from the toner tank (T1, T2, T3, T4) to the developing unit (126K, 126C, 126M, and 126Y); and a connecting unit for connecting the toner supply member to the developing unit (126K, 126C, 126M, and 126Y), which connecting unit is configured to jut outwardly from the surface of the process cartridge; a cooling unit that cools the developing unit (126K, 126C, 126M, and 126Y) by generating an airflow in a direction that is approximately the same as a direction of supply of toner from the toner supply unit to the developing unit (126K, 126C, 126M, and 126Y), the process cartridge together with the connecting unit is configured to be attached to or detached from the toner supply member in a direction parallel to a direction in which the toner supply member is configured to supply the toner, and that the cooling unit is configured to generate the airflow such as to facilitate that toner transferred from the toner supply member is pushed to a side of the developing unit (126 K, 126 C, 126 M, and 126 Y). a developing structure that includes a process cartridge which houses a developing unit (126K, 126C, 126M, and 126Y) that develops an image by using toner; and a toner supply unit that is provided between the toner tank (T1 to T4) and the developing unit (126K, 126C, 126M and 126Y) and which includes a toner tank (T1 to T4), which toner tank (T1 to T4) is configured to contain toner and a process cartridge which houses a developing unit (126K, 126C, 126M, and 126Y) that develops an image by using toner; and a toner supply unit that is provided between the toner tank (T1 to T4) and the developing unit (126K, 126C, 126M and 126Y) and which includes a toner tank (T1 to T4), which toner tank (T1 to T4) is configured to contain toner and a toner supply member that supplies toner from the toner tank (T1, T2, T3, T4) to the developing unit (126K, 126C, 126M, and 126Y); and a connecting unit for connecting the toner supply member to the developing unit (126K, 126C, 126M, and 126Y), which connecting unit is configured to jut outwardly from the surface of the process cartridge; a connecting unit for connecting the toner supply member to the developing unit (126K, 126C, 126M, and 126Y), which connecting unit is configured to jut outwardly from the surface of the process cartridge; a cooling unit that cools the developing unit (126K, 126C, 126M, and 126Y) by generating an airflow in a direction that is approximately the same as a direction of supply of toner from the toner supply unit to the developing unit (126K, 126C, 126M, and 126Y), the process cartridge together with the connecting unit is configured to be attached to or detached from the toner supply member in a direction parallel to a direction in which the toner supply member is configured to supply the toner, and that the cooling unit is configured to generate the airflow such as to facilitate that toner transferred from the toner supply member is pushed to a side of the developing unit (126 K, 126 C, 126 M, and 126 Y).