An image forming apparatus comprising: a main body that comprises a door capable of opening and closing; a process cartridge that is configured to be installed in the main body and includes a toner inlet; and a toner cartridge that contains toner to be supplied to the process cartridge, and is attachable to and detachable from the main body through the door, wherein the toner cartridge comprises: a toner outlet connectable to the toner inlet; an inner shutter having an opening and being configured to move to an open position in which the opening is in communication with the toner outlet and a closed position in which the toner outlet is closed, and an outer shutter that is configured to move to a first position, in which the toner is not allowed to be discharged, and a second position, in which the toner is allowed to be discharged through the opening, wherein the outer shutter moves to the second position when the toner cartridge is attached to the main body, characterized in that the image forming apparatus is configured such that the inner shutter moves from the closed position to the open position by being interlocked in a closing operation of the door after the toner cartridge is loaded into the main body, wherein the image forming apparatus further comprises a first elastic member to apply an elastic force to the outer shutter so that the outer shutter is located at the first position covering the inner shutter. a main body that comprises a door capable of opening and closing; a process cartridge that is configured to be installed in the main body and includes a toner inlet; and a toner cartridge that contains toner to be supplied to the process cartridge, and is attachable to and detachable from the main body through the door, wherein the toner cartridge comprises: a toner outlet connectable to the toner inlet; an inner shutter having an opening and being configured to move to an open position in which the opening is in communication with the toner outlet and a closed position in which the toner outlet is closed, and an outer shutter that is configured to move to a first position, in which the toner is not allowed to be discharged, and a second position, in which the toner is allowed to be discharged through the opening, wherein the outer shutter moves to the second position when the toner cartridge is attached to the main body, a toner outlet connectable to the toner inlet; an inner shutter having an opening and being configured to move to an open position in which the opening is in communication with the toner outlet and a closed position in which the toner outlet is closed, and an outer shutter that is configured to move to a first position, in which the toner is not allowed to be discharged, and a second position, in which the toner is allowed to be discharged through the opening, wherein the outer shutter moves to the second position when the toner cartridge is attached to the main body, characterized in that the image forming apparatus is configured such that the inner shutter moves from the closed position to the open position by being interlocked in a closing operation of the door after the toner cartridge is loaded into the main body, wherein the image forming apparatus further comprises a first elastic member to apply an elastic force to the outer shutter so that the outer shutter is located at the first position covering the inner shutter.