A method for manufacturing a liquid ejection head including a substrate and a member, disposed above the substrate, having passages communicatively connected to discharge ports through which a liquid is ejected includes providing first solid layers made of a positive photosensitive resin above the substrate such that outer side surfaces of the first solid layers form an obtuse angle with the substrate; providing a second solid layer above the substrate such that the second solid layer abuts the outer side surfaces of the first solid layers, the second solid layer being processed into at least one portion of a mold for the passages; exposing portions of the outer side surfaces of the first solid layers through the second solid layer; removing the exposed portions from the first solid layers; and providing a cover layer over the second solid layer, the cover layer being processed into the member.