A print element substrate is absorbed and held by a handling jig to define a predetermined location and position of the print element substrate with respect to the supporting member. In this instance, the handling jig is provided with a convex portion. Therefore, when the print element substrate is joined to the supporting member, the convex portion comes into contact with a surface of the supporting member, so that it is possible to define the height of the print element substrate with respect to the joining surface. This makes it possible to control the amount and height of squash by the print element substrate exerted on the adhesive agent applied on the joining surface. It is possible to prevent the redundant adhesive agent from spilling out in a print liquid flow path.