Drum cartridge including movable holder having holder terminal, and relay electrode electrically connectable to holder terminal and memory of developing cartridge attached to drum frame

A drum cartridge comprising:

• a drum frame to which a developing cartridge is attachable, the developing cartridge including:
• a developing roller rotatable about a developing axis extending in a first direction;
• and a memory storing information about the developing cartridge;
• a photosensitive drum rotatable about a drum axis extending in the first direction;
• a drum electrical contact surface positioned at one end portion of the drum frame in the first direction;
• a relay electrode configured to be electrically connected to the memory in a state where the developing cartridge is attached to the drum frame;
• and
• a holder positioned at the one end portion of the drum frame in the first direction and movable relative to the drum frame, the holder holding the drum electrical contact surface and having a holder terminal electrically connected to the drum electrical contact surface, the holder terminal being electrically connectable to the relay electrode.