PURPOSE: To favorably perform the cleaning of orifice surfaces, prevent a clogging of the orifices from occurring, and improve a printing quality by providing an opening to feed an ink on the lower surface of a cartridge main body, and providing a plurality of resistance heating elements which vaporize the fed ink.

CONSTITUTION: This print head cartridge 50 is equipped with a main body 12 and a resistance structure 24, but does not have an orifice plate by forming an orifice on a flexible mutual connection circuit 52. The flexible mutual connection circuit 52 is equipped with an orifice 54 for a first row, and an orifice 56 for a second row. The orifices are formed through the flexible mutual connection circuit 52 by laser-processing a conical opening through the flexible mutual connection circuit 52. The diameter of the orifices is formed in a manner to gradually become smaller as separating from the resistance structure.