To provide a useful supporting structure for a board material, by which the lower surface of a central section of the board material such as a wide top board can effectively be brought into roll contact and supported by an intermediate support without generating a secondary trouble.

Both of the right and left side edge sections of the top board 2 which is a board material are longitudianlly slidably supported by a movable roller 20 which is a main support. At the same time, the lower surface of the central section of the top board 2 is brought into roll contact and supported by a second fixed roller 24 which is the intermediate support. In the supporting structure, a regulating section 62 which regulates a behavior in the vertical direction to the rear edge section of the top board 2 when the top board 2 is moved to a rear sliding position 2B is provided.

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