PURPOSE: To place a facing curb in the joint direction to assemble the curb accurately, speedily and efficiently by providing an identification channel over the length of the outside of the facing curb, and mating the identification channel correspondingly in the case the facing curb is assembled to make flush between facing surfaces.

CONSTITUTION: Chamfering work faces 21a and 21b are provided respectively to sides 2a and 2b, and a fitted channel 10 fitted to a framing of a wooden door is formed. At that time, coated surface bodies 1a and 1b coating a joint part with the framing are provided to both sides of the fitted channel 10, and a fitting channel 31 such as a panel board, glass, etc., is provided over the length to the center of the lower surface 3. At that time, a position of a cutter placed in correspondence with a molding machine is finely different, and widths (a), (a'). (b) and (b') of the coated surface bodies 1a and 1b and faces 21a and 21b are also finely different. The channel 31 is slightly slipped from the center of the lower surface 3. In the case a square facing frame body is assembled, the identification channel 11 provided over the length of the fitted channel 10 is met, and an uneven step between the faces 21a and 21b is prevented to make flush.