To provide a joining structure for apparatus capable of preventing the occurrence of adhesion of the Zn-Cu component precipitated out of a member made of brass to the surface of a member consisting of stainless steel by heating during brazing within a reducing atmosphere furnace as far as possible.

A lower cap member 16 made of the stainless steel to be brazed to a body section 14 formed of the brass is previously subjected to a solid solution heat treatment and after the member 16 subjected to the solid solution heat treatment and the body section 14 made of the brass are brazed in the reducing atmosphere furnace, both are taken out of the reducing atmosphere furnace and an upper cap member 22 made of the stainless steel is joined by welding to the lower cap member 16.