Developing Device Having Communication Portion and Conveying Member to Convey Developing Agent

A developing device comprising:

• a housing;
• a developing agent reservoir detachably supported by the housing and configured to accommodate a developing agent;
• a developing roller having an axis extending in a first direction and a first outer peripheral surface configured to carry the developing agent thereon, the developing roller being supported by the housing and rotatable about the axis in a first rotating direction;
• a supply roller comprising:
• a core member having a second outer peripheral surface and extending in parallel to the axis, the core member being supported by the housing and rotatable in a second rotating direction;
• a brush portion containing fibers implanted on the second outer peripheral surface and configured to contact the developing roller to supply the developing agent in the developing agent reservoir to the developing roller, a contact portion being defined between the brush portion and the developing roller;
• a first regulating member having a first fixed portion fixed to the housing, and a first contacting portion contacting the first outer peripheral surface at a position downstream of the contact portion in the first rotating direction, the first contacting portion being configured to regulate the developing agent on the first outer peripheral surface to a constant thickness;
• a second regulating member having a second fixed portion fixed to the housing, and a second contacting portion contacting the brush portion at a position upstream of the contact portion in the second rotating direction, the second contacting portion being configured to regulate the developing agent on the supply roller to a constant amount, the housing having a first part positioned downstream of the second regulating member in the second rotating direction, and a second part positioned upstream of the second regulating member in the second rotating direction;
• a communication portion configured to provide communication between the first part and the second part;
• and
• a conveying member positioned in the first part and configured to convey the developing agent in the first part to the communication portion.