Developing device

A developing cartridge comprising:

• a developing agent container that accommodates therein a developing agent, and
• an agitator disposed in the developing agent container and rotatable about a rotation axis in a rotational direction to agitate the developing agent,
• the developing agent container comprising;
• an arcuate bottom wall whose center of radius of a curvature is coincident with the rotation axis, the arcuate bottom wall having a lowermost point and an inner surface;
• and
• an arcuate protruding wall having an inner surface and protruding from the bottom wall in a direction away from the rotation axis and positioned downstream of the bottom wall in the rotational direction, the arcuate protruding wall being formed with an opening through which the developing agent is discharged from the developing agent container to an outside, the opening having an upstream end and a downstream end in the rotational direction, the arcuate protruding wall having a center point defining a radius of a curvature of the arcuate protruding wall, the center point being positioned at a side of the rotation axis with respect to a first imaginary vertical plane passing through the upstream end in an operational state, the inner surfaces of the bottom wall and the arcuate protruding wall extending diagonally upward from the lowermost point to the downstream end in the operational state,
• wherein the center point defining the radius of the curvature of the arcuate protruding wall is positioned higher than the center of radius of the curvature of the arcuate bottom wall.