| 摘要 |
A toner cartridge (20) has a cartridge main body (21) as a container filled with a developer and a shutter mechanism (25) that opens and closes a developer discharging orifice (231) formed in the cartridge main body (21). The cartridge main body (21) has a pair of end walls (left end wall (22) and right end wall (23)) opposing each other and a barrel (24) installed between a pair of these end walls (22) and (23). A shape of a cross section of the barrel (24) orthogonal to a direction of a tube center line is set to a shape of a Reuleaux polygon.
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