| 摘要 |
<p>Provided is a plate material (1) having a concavo-convex portion (20). With a first reference surface (K1) and a second reference surface (K2) set as references, on the second reference surface (K2), a large number of first reference areas (213) having an approximately H-letter shape, which are constituted of two longitudinal bar portions (214) and a lateral bar portion (215) that connects center parts of the longitudinal bar portions with each other, are arranged with the first reference areas faced in the same direction. On the plate material (1), the concavo-convex portion (20) is provided which is formed of a first area (21) constituted of a first top surface (211) and a first side surface (212), the first top surface (211) being obtained by decreasing in size and projecting the first reference area (213) on the first reference surface (K1) so that a projection is caused from the first reference area (213) on the second reference surface (K2) toward the first reference surface (K1), the first side surface (212) connecting the outline of the first top surface (211) with the outline of the first reference area (213).</p> |
