Patent ID: 8643690

Claim:
A developer cartridge comprising: a developer-accommodating chamber configured to accommodate developer, the developer-accommodating chamber having a side wall; at least one window for detecting an amount of developer remaining in the developer-accommodating chamber, the at least one window being provided in the side wall; an agitating member configured to stir the developer accommodated in the developer-accommodating chamber, the agitating member having a rotational shaft extending in an axial direction perpendicular to the side wall; a fixing member disposed on the agitating member and having a first plate part and a second plate part opposing each other, the first plate part and the second plate part defining a slit therebetween, the slit being directed in an inserting direction parallel to the axial direction; one of the first plate part and the second plate part having a protruding part that protrudes inward in a direction that the first plate part and the second plate part confront each other; and a cleaning member configured to clean the at least one window, the cleaning member being interposed between the first plate part and the second plate part and fixed to the fixing member by being inserted into the slit in the inserting direction, the cleaning member having a through-hole configured to receive the protruding part therein.