To provide an artificially drying method for raising a use value as a structure material by raising a surface hardness of a cedar material considered to have only a strength of 75% compared with that of an imported material (an Oregon pine) as a pure material in order to propagate domestic materials having a tendency of being pressed down by imported materials of a low cost while generation of inferior goods is solved by shortening a period to be taken for initial drying artificial drying which are required for manufacturing dry wood and suppressing sudden drying of a surface layer part becoming causes for occurrence of a crack, a stress and the like.

After carrying out dehydration treatment of free water contained in wood by utilizing a centrifugal force as a means for hastening an initial drying stage of wood and dynamically moving the wood, a surfaces is pressed by an iron plate at a high temperature, a carbonized and compacted layer is formed in a surface layer part, and suppression of surface drying becoming a cause for a crack, improvement of shape stability and increase of strength are achieved.