Plywood is a three-layer or multi-layered plate-like material which is formed by cutting a wooden section into a veneer or by cutting into a thin wood by wood, and then bonding with an adhesive. Usually, an odd-numbered veneer is used, and adjacent veneers are made. The fiber directions are glued to each other vertically. Plywood is one of the commonly used materials for furniture and is a wood-based panel. A set of veneers are usually glued to each other in a vertical direction in the direction of the wood grain of the adjacent layers. Usually, the front and inner plates are symmetrically disposed on either side of the center layer or the core. The slabs which are formed by laminating the veneered veneers in the direction of wood grain are pressed under heating or no heating.