Image forming device including toner cartridge having shutter

An image forming device comprising:

• a main casing;
• a support member movable relative to the main casing between an accommodated position within the main casing and a pulled-out position outside the main casing;
• a plurality of photosensitive drums supported on the support member and aligned in a line at intervals;
• a plurality of developing units corresponding to the plurality of photosensitive drums and supported on the support member;
• a plurality of toner cartridges corresponding to the plurality of developing units and detachably mounted on the support member, wherein each of the toner cartridges includes a casing formed with an opening for supplying toner accommodated in the casing to the corresponding one of the developing units and a shutter movable relative to the casing to selectively open and close the opening;
• and
• a plurality of operation members corresponding to the plurality of toner cartridges and supported on the support member, wherein each of the operation members is operated in a first direction substantially parallel to an axial direction of the photosensitive drums to press one of the casing and the shutter, thereby moving the shutter relative to the casing in the first direction to open the opening.