To provide a processing method capable of reducing a degree of warping and capable of improving productivity even when a thick oriented woody thermocompression molded material is divided and thinned.

In the method for dividing and processing the oriented woody thermocompression molded material, the material is cut out from the surface, and is divided in a thickness direction. The material is preferably prepared by thermocompression-molding a laminated article of a narrow and long wood material piece with a bonding agent oriented in a longitudinal direction, and preferably has a specific gravity of 0.6-1.0, a thickness of 50 mm or more and a length of 1,800 mm or more. The wood material piece is preferably derived from thinnings, an end material, a waste pallet or a dismantled waste material, and 70% or more by weight of the wood material piece preferably has a thickness of 1-11 mm and a length of 20-150 mm.