PURPOSE: To facilitate the burying of a metallic pin by the pressing from above a substrate, and besides, prevent the relaxation and slip off by the heating or vibration in use of the metallic pin, in a jig for assembling electronic parts, which has a metallic pin on a carbon or ceramic material substrate.

CONSTITUTION: A metallic pin is the shape of having an abutting part on its collar at about the middle, and a vertical through hole 7 is provided on the surface of a carbon metallic substrate 1, and the metallic pin is inserted into the through hole of the board 1, being pressed from above, and then a collar 8 or a push nut is set on the top, on the rear side of the board 1, of the pin and is fixed by press.