PURPOSE: To support a plurality of moving materials of coming up and down materials and the like without narrowing the utility space of a base, substance and reducing it in size by fixing a guide material respectively to a base substance, first moving substance, and second moving substance, and inserting these guide materials therethrough coaxially and slidably.

CONSTITUTION: A base substance 31 is fixed with two guide posts (guide materials) 32 in the form of being separated right and left, and hollow cylindrical guide bushes (guide material) 33 and guide rods (guide material) 34 are coaxially pierced slidably therethrough in up and down direction. The guide bushes are fixed to a first moving substance 35 in their lower ends respectively and project upwardly from upper surfaces thereof, and the guide rods 34 are fixed to a second moving substance 36 in their lower ends respectively and project upwardly and inserted into the guide bushes slidably. Thus, a guide mechanism 40 are composed of these materials. Wherein, the first moving substance 35 is relatively movable up and down with respect to the base substance 31 and second moving substance 36.