| 摘要 |
A developer cartridge (31) includes: a casing (60) that stores a developer and is provided with a window hole (62); a stopper nail provided the window holes (62); and a window member (64) having a transmission portion that transmits light passing through the window hole, and a stopped portion (73) in which the stopper nail (75A,75B) is fitted, wherein the window member is closely retained in the window hole by fitting the stopper nail in the stopped portion. |
