Liquid ejection head

A liquid ejection head in which a plurality of ejection ports are arrayed, the liquid ejection head including:

• a first substrate having an energy generation element in one of surfaces and first supply ports passing through the first substrate from the one surface to a first bonded surface which is the other surface;
• and
• a second substrate which is bonded at a second bonded surface to the first bonded surface of the first substrate in a stack direction with an adhesive interposed in between, and which has second supply ports communicating with the first supply ports, the second supply ports passing through the second substrate from the second bonded surface to the other surface of the second substrate, wherein
• each of the first supply ports has a first portion including a first opening formed in the first bonded surface and a third portion including a third opening formed on a side including the energy generation element in the first substrate, an opening area of the third opening being smaller than an opening area of the first opening,
• in the first portion, a lateral side and an upper side which is a portion connected to the third portion intersect and form an obtuse angle,
• each of the second supply ports has a second opening in the second bonded surface, and
• in at least one direction out of an array direction of the ejection ports and a direction orthogonal to the array direction, a width W1 of the first opening and a width W2 of the second opening satisfy W1>W2.