An ink cartridge is provided with a body, a channel module attached to the body, a plurality of first engaging parts, and a plurality of second engaging parts. The first engaging parts are arranged on one of the body and the channel module, while the second engaging parts corresponding to the first engaging parts are arranged on the other of the body and the channel module. The relative position of the body and the channel module on a two-dimension plane is substantially fixed by the engagement of the first engaging parts and the second engaging parts.