DEVELOPING CARTRIDGE

A developing cartridge includes: a casing; a developing roller rotatable about a developing roller axis extending in a first direction; a first agitator rotatable about an agitator axis extending in the first direction; an agitator gear positioned at one end in the first direction of the casing and rotatable about the agitator axis together with the agitator; a first protrusion; a developing memory; a first electrical contact surface; and a first holder holding the first electrical contact surface. The agitator gear includes a large diameter gear and a small diameter gear positioned between the large diameter gear and the casing in the first direction. The first protrusion protrudes outward from the one end in the first direction of the casing, and positioned between the casing and the large diameter gear in the first direction. The first holder is positioned farther from the first protrusion than the large diameter gear is in the first direction. The first holder and the first electrical contact surface are movable relative to the casing.