Liquid ejection head and liquid ejection apparatus

A liquid ejection head, comprising:

• a connecting surface having a plurality of connecting portions connected to a plurality of liquid passages provided in a liquid passage member,
• wherein the connecting surface comprises:
• a first positioning portion of a slotted hole fitted in a first positioning portion provided in the liquid passage member so as to determine relative positions between the plurality of liquid passages and the plurality of connecting portions in one direction of directions along the connecting surface, the first positioning portion being provided on the connecting surface, and
• a second positioning portion of a slotted hole fitted in a second positioning portion provided in the liquid passage member so as to determine relative positions between the plurality of liquid passages and the plurality of connecting portions in the one direction and the other direction perpendicular to the one direction, of the directions along the connecting surface, the second positioning portion being provided on the connecting surface, and
• wherein a first distance between a weight center of gravity of the first positioning portion of the connecting surface in a direction in a plane parallel to the connecting surface and along the connecting surface and a weight center of gravity of the connecting portion in the direction along the connecting surface, farthest from the first positioning portion of the connecting surface is longer than a second distance between a weight center of gravity of the second positioning portion of the connecting surface in the direction along the connecting surface and a weight center of gravity of the connecting portion in the direction along the connecting surface, farthest from the second positioning portion of the connecting surface.