In a liquid ejection apparatus including a plurality of chips arranged in a specific direction, each chip including a plurality of liquid ejection units juxtaposed in the specific direction, the displacement of liquid landing position in the specific direction is reduced. A printer head chip includes a heating resistor, which is divided into two and arranged within one ink liquid chamber. The two-divided heating resistors within the one ink liquid chamber are juxtaposed in a direction perpendicular to the lining-up direction of nozzles.