A bottom reception pin module 22 which is allowed to stand upright on a bottom reception base part 21 having a magnetic member 21a provided on an upper surface to support a board includes a base part 23 having a magnet member 26 built therein so as to be freely lifted and lowered and fixed to the bottom reception base part 21 by a magnetization force under a state that the magnet member 26 is lowered and a hollow shaft member 24 extended upward from the base part 23 and having an upper end of a top member 25 abutting on the lower surface of the board to support the board. By a vacuum suction from a suction hole 25c, the magnet member 26 is lowered and lifted to fix and unfix the base part 23 relative to the bottom reception base part 21.