PURPOSE: To prevent the warpage of a sliding door, in which one side is used as a Western door and the other side is employed as a Japanese sliding door.

CONSTITUTION: Woody boards 13, 14 are stuck on the surface and rear of a frame body 12 in a sliding door 11, a Western decorative plastic sheet 15A or a Western facial tissue is pasted on the surface of the woody board 13 on the surface side, and the Western decorative plastic sheet 15A or a plastic sheet 15B of the same kind as the Western facial tissue or paper is stuck on the surface of the woody board of the rear side 14. The woody board 14 on the rear side has structure, in which a surface board 17, in which a Japanese facial tissue 19 is pasted on a surface, is applied in a displaceable manner, and applied shrinkage force at the time of the bonding of the Japanese facial tissue 19 is absorbed by displacement to the woody board 14 of the surface board 17.