FIGS. 21A and 21B are conceptual diagrams of a laminate film in a state in which the laminate film is curved toward the upper side due to an external force.

In a case where curvature occurs toward the upper side as illustrated in FIG. 21B from the state in FIG. 21A, the force is applied in a direction in which wave 210 on the top surface of the protrusion shrinks with laminate film 202 on the lower side as a base. Pitches of the wave shapes become narrow, and thereby an amount of the shrinkage can be absorbed to a certain extent. However, when the amount of the shrinkage becomes greater, it is not possible for the laminate film, to shrink exceeding the certain amount, and wrinkling or cracking is likely to appear.

FIG. 22 is a view illustrating a state in which the laminate film is curved. Since side surface 211 of the protrusion is curved in a state of being vertically upright, the side surface receives an intense force of extension and contraction as illustrated in FIG. 23. Top surface side 212 of the side surface of the protrusion receives the extension force and lower surface side 213 of the side surface of the protrusion receives the compression force. It is not possible for the laminate film to deform along with the extension force and, as a result, cracking is likely to appear in side, surface 211 of the protrusion.