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1. A liquid ejection head comprising:
first supply ports and second supply ports set apart from each other in a first direction, and third supply ports situated between the first supply ports and the second supply ports in the first direction, the first, second and third supply ports piercing through a substrate, a plurality of the first supply ports, a plurality of the second supply ports and a plurality of the third supply ports being arranged in a first supply port array, a second supply port array and a third supply port array, respectively, the first, second and third supply port arrays extending in a second direction crossing the first direction; and a first ejection port array of first ejection ports arrayed in the second direction and situated between the first supply port array and the third supply port array with respect to the first direction, and a second ejection port array of second ejection ports arrayed in the second direction and situated between the second supply port array and the third supply port array with respect to the first direction, liquid supplied from the first, second and third supply ports being ejected through the first and second ejection ports, wherein each of the third supply ports includes a first portion situated on the side of the first ejection ports with respect to the first direction, a second portion situated on the side of the second ejection ports with respect to the first direction and a third portion situated between the first portion and the second portion, and the first portion and the second portion are greater than the third portion in a dimension as measured in the second direction.
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