NOVELTY - Manufacturing a plate with corrugations comprises that a surface layer (6) is arranged on an upper surface of clay (5) arranged on a stretched rubber sheet (4) and corrugations are formed on the upper face of the clay and the surface layer, by contracting the rubber sheet.    USE - For manufacturing plate with corrugations at upper face, to cover embankment of river, and wall surface of various buildings, and for use as photocatalyst support, anchor plate of sea weeds and larva of coral, adsorption material, deodorizing material, sustained release materials, luminous material, sensor, heat-radiation material, heat generation material, heat exchange material, capacitor, electrode of fuel cells, artificial bone, electromagnetic wave absorber, light reflection plate, light diffusion plate, and biomaterial for use in artificial kidney and lung.    ADVANTAGE - Prevents the tips of the ridges which form the corrugations, from being in direct contact with each other, by the surface layer. Hence, several open grooves are reliably formed at the surface of the plate. Hence, improves the sound absorption ability of the plate by producing the plate having a wide surface area.    DETAILED DESCRIPTION - Manufacturing a plate with corrugations comprises that a surface layer (6) is arranged on the upper surface of the clay (5) arranged on a stretched rubber sheet (4). The surface layer is made of material which burns when the clay is baked. Corrugations are formed on the upper face of the clay and the surface layer, by contracting the rubber sheet. The clay is baked and surface layer is burnt and removed, subsequently, to form a plate (2a) with corrugations at upper face.    An INDEPENDENT CLAIM is also included for manufacturing apparatus of plate with corrugations at upper face.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view depicting the several stages in the manufacture of the plate with corrugations at the surface. (Drawing includes non-English language text).    plate (2a)    rubber sheet (4)    clay (5)    surface layer (6)