Toner cartridge and image forming apparatus

A toner cartridge configured to supply toner to an electrostatic latent image formed on an image carrier, so as to develop the same into a toner image, the toner cartridge comprising:

• a toner container configured to store the toner;
• a development unit connected to the toner container via a connection hole, the development unit having an external opening on its outer periphery surface so as to supply the toner to the image carrier;
• a toner carrier disposed in the development unit in a rotatable manner, so as to face the image carrier, the toner carrier carrying the toner;
• an outer shutter configured to open and close the external opening;
• an inner shutter configured to open and close the connection hole;
• and
• a gear mechanism configured to connect the outer shutter and the inner shutter to be capable of interlocking with each other, wherein
• the outer shutter is movable at least between a first closing position to close the external opening and a first opening position to open the external opening,
• the inner shutter is movable at least between a second closing position to close the connection hole and a second opening position to open the connection hole, and
• when the outer shutter is in the first closing position, the inner shutter is in the second closing position, while when the outer shutter is in the first opening position, the inner shutter is in the second opening position.