Patent ID: 8457523

Claim:
An image forming apparatus comprising: a main body casing; a holder unit configured to move between an accommodated position where the holder unit is accommodated in the main body casing and a pulled out position where the holder unit is pulled out from the main body casing; a plurality of photosensitive drums configured to be held by the holder unit and juxtaposed with each other with an interval between neighboring photosensitive drums; a plurality of developing units configured to be held by the holder unit and each corresponding to each photosensitive drum to develop the corresponding photosensitive drum; and a plurality of toner cartridges configured to be attached to the holder unit when the holder unit is in the pulled out position and each corresponding to each developing unit to supply toner, each of the toner cartridges comprising: a case containing the toner and formed with an opening at a position confronting the corresponding developing unit in a state that the toner cartridge is attached to the holder unit; a shutter movable between a block position where the shutter blocks the opening and an open position where the shutter opens the opening; and an operation member for operating the shutter such that the shutter moves between the block position and the open position, the shutter being located at the open position when the operation member is located at a first position, the shutter being located at the block position when the operation member is located at a second position, an interference member that is configured such that the operation members abut the interference member to be displaced from the second position to the first position when the holder unit is moved from the pulled out position to the accommodated position.