To obtain prescribed caulking by installing a ruler part capable of setting the extent of driving so as to regulate the caulking under a prescribed pressure by the driving when driving a wedge metal fixture in the wedge metal fixture and driving the wedge metal fixture into the ruler part so that the ruler part is an antislip part for preventing the wedge metal fixture from slipping out in an assembling apparatus for caulking an outside plate and a machine body together with the wedge metal fixture and a wedge receiver.

This assembling apparatus for an outside plate 3 is obtained by opening and providing a square hole 31 formed in a joining wall 30 of the outside plate 3 on the side of an upper position with a larger diameter than that of a square hole 11 opened and provided in a joining wall 10 on the side of a lower position in the inserting direction of a wedge metal fixture 4, forming a fitting recessed part (w) before a wedge receiver 2 in the inserting direction of the wedge metal fixture 4 when joining the joining wall 30 to the joining wall 10 and forming and providing a notched part (y) fitting onto the fitting recessed part (w) when driving the wedge metal fixture 4 in the wedge receiver 2 and caulking both together in a site a little to the head 40 on the side of the base of a body part 41 in the wedge metal fixture 4.