PURPOSE: To improve the reliability of joining strength between dissimilar metals by providing a channel part in one of components of body composed of metals to cast the dissimilar metal in the channel part in a melting condition thereof.

CONSTITUTION: A component 2 of body composed of stainless steel material, a channel part 3 having a taper 4 and an accessary component 1 are formed. The channel part 3 having the taper 4 is closely filled with the accessary component 1 composed of gold and gold alloy. At this time, the taper 4 provided in the channel part 3 plays a part for mechanically fixing the accessary parts on the component 2 of body to prevent the accessary component 1 from falling off. The shape of the taper 4 has a part of the taper in the bottom face, it is good that the lower part has a projection-like shape and is widened.