PURPOSE: To set a rod-shaped part such as a bolt at a destination very easily and completely.

CONSTITUTION: This setting device has an internal space 13 where a taper decreasing toward an open part is formed, and if circumstances require, it consists of an outer easing 1 where the cross section of the space is polygonal, and an internal insertion body 2 whose external view meets the wall surface of the internal space 11, and which has serrated irregularities 21 whose teeth is inclined to the depth side in the inner wall of the central part. With this constitution, the internal insertion body 2 is accommodated in the internal space 13 of the outer easing to chuck a rod-shaped part, 5 inserted by moving it to the open side.