An image forming apparatus includes: an image carrier on which an
electrostatic latent image is formed; a toner cartridge detachably
mountable to the image forming apparatus, including a toner casing
accommodating a developing agent, an opening/closing member which
opens/closes an opening formed in the toner casing to discharge the
developing agent, and an operation member operating the opening/closing
member; and a developing unit to develop the electrostatic latent image
by the developing agent discharged from the opening. The operation member
can move between an open position for operating the opening/closing
member to open the opening, and a close position for operating the
opening/closing member to close the opening, and the operation member
forms a part of a transport path of a recording medium in the image
forming apparatus at the open position in a state where the toner
cartridge is mounted in the image forming apparatus.