Developing cartridge including first frame supporting developing roller and having load receiving surface, and second frame fixed to first frame

A developing cartridge attachable to a drum cartridge, the developing cartridge comprising:

• a developing roller rotatable about an axis extending in a first direction;
• a casing configured to accommodate developing agent therein, the casing having one end portion in a second direction at which the developing roller is positioned, the second direction crossing the first direction, the casing including:
• a first frame supporting the developing roller;
• and
• a second frame fixed to the first frame;
• and
• a separation member movable in the first direction relative to the casing, the separation member including:
• a separation shaft extending in the first direction;
• and
• a first inclined surface positioned at one end portion in the first direction of the separation member, the first inclined surface extending away from the developing roller in the second direction as extending toward another end portion in the first direction of the separation member,
• wherein the first frame has a load receiving surface facing the separation shaft in the second direction, the load receiving surface making contact with the separation shaft to receive a load directed in the second direction from the separation shaft when the separation member moves in the first direction and the first inclined surface makes contact with the drum cartridge in a state where the developing cartridge is attached to the drum cartridge.