Patent ID: 8721047

Claim:
A liquid ejection head comprising: a member having a plurality of ejection openings for ejecting liquid; and a substrate having first and second element arrays in each of which a plurality of elements for generating energy used for ejecting liquid are arrayed in a first direction, and a supply port array in which a plurality of supply ports for supplying liquid to the elements are arrayed in the first direction, each of the supply ports being formed as a hole passing through the substrate, wherein the first element array, the supply port array and the second element array are arrayed in the order as listed in a second direction intersecting with the first direction, and a wiring for driving the elements, which is connected to the elements of the second element array, passes between the supply ports of the supply port array and extends to a first element array side, and wherein a length of each of the supply ports of the supply port array, which is measured along the first direction, is greater than a length of each of the elements of the first and second element arrays, which is measured along the first direction.