Adhesive is applied around each recess 22 by means of a dispenser or by screen printing, and the two substrates are laminated as shown in FIGS. 3A, 3B and 3C. FIG. 3A is a sectional view, FIG. 3B is a plan view taken from the side of the substrate 25, and FIG. 3C is a plan view taken from the side of the sealing substrate 21.