Developing cartridge including casing and first and second agitators for agitating toner accommodated in casing

A developing cartridge comprising:

• a developing roller rotatable about a developing roller rotation axis extending in a first direction;
• a casing configured to accommodate toner, wherein the casing has one end portion in the first direction, the one end portion having an outer surface;
• a first agitator configured to agitate the toner, the first agitator being rotatable about a first agitator rotation axis extending in the first direction;
• a second agitator positioned between the developing roller and the first agitator, the second agitator being rotatable about a second agitator rotation axis extending in the first direction, wherein a rotation locus of the second agitator is positioned outside of a rotation locus of the first agitator;
• a coupling positioned at the outer surface, the coupling being rotatable about a coupling axis extending in the first direction, the coupling comprising a coupling gear portion;
• a first agitator gear positioned at the outer surface, the first agitator gear being rotatable together with the first agitator according to rotation of the coupling;
• a second agitator gear positioned at the outer surface, the second agitator gear being rotatable together with the second agitator according to rotation of the coupling, the second agitator gear being positioned closer to the outer surface in the first direction than the coupling is to the outer surface, at least a part of the second agitator gear being positioned between the coupling and the outer surface in the first direction;
• a drive gear rotatable according to rotation of the coupling;
• and
• a support member having a flat plate shape, the support member having one side portion and another side portion opposite to each other in the first direction, the one side portion being positioned farther from the outer surface than the another side portion is from the outer surface,
• wherein the coupling is rotatably supported at the one side portion of the support member, and
• wherein the drive gear is positioned at the another side portion of the support member.