Patent ID: 8331829

Claim:
A developer cartridge comprising: a cartridge cabinet comprising: a developer accommodating chamber configured to accommodate developer; and a supply opening that is provided in one wall surface and is configured to supply the developer from inside of the developer accommodating chamber to outside of the developer accommodating chamber; a rotational shaft that is rotatably supported in the cartridge cabinet, extends parallel to the one wall surface and extends through the inside of the developer accommodating chamber; an agitating blade that is made of a film and supported by the rotational shaft and rotates with the rotational shaft to supply the developer toward the supply opening while agitating the developer; and an obstruction member that is made of a rigid resin and supported by the rotational shaft and rotates with the rotational shaft following the agitating blade to obstruct the supply opening during rotation of the rotational shaft, wherein the one wall surface comprises a return opening configured to return the developer from the outside of the developer accommodating chamber to the inside of the developer accommodating chamber.