Patent ID: 8075107

Claim:
A liquid ejection head having an ejection opening which ejects liquid, comprising: an element substrate provided with, on a surface thereof, an element which generates energy utilized for ejecting liquid; and a resin layer provided on the surface of the element substrate, the resin layer having a wall for a liquid passage communicated with the ejection opening, wherein the element substrate has a first electrode layer and a second electrode layer at the surface side, the first electrode layer is provided in such a manner that the first electrode layer is positioned at a portion corresponding to an end of the resin layer with respect to a direction along the surface, and the second electrode layer electrically connected to the first electrode layer is provided on an upper side of the first electrode layer in such a manner that the second electrode layer is not positioned at the portion corresponding to the end of the resin layer, and wherein the second electrode layer is provided as two members independent of each other, each of the two members is contacted with the first electrode layer, and the two members are electrically connected with each other only through the first electrode layer.