A scroll type fluid machine comprising: a hermetic container made of an iron-based material; a scroll unit accommodated in the hermetic container and driven by an electric motor to perform a series of processes from suction to discharge of a working fluid; and piping configured to allow the working fluid to flow from outside of the hermetic container to the scroll unit or vice versa through a through hole formed through the hermetic container, wherein the piping includes a boss fitted into the through hole from outside of the hermetic container and forming a joint in cooperation with the hermetic container to seal up the through hole, an internal pipe inserted through the boss into the scroll unit, and an external pipe inserted into the internal pipe and projecting from the boss to the outside of the hermetic container, and the joint is formed by joining the boss to the hermetic container by welding, characterized in that the internal pipe is made of a copper-plated, iron-based material; the external pipe is made of a copper-based material; the boss is made of a copper-plated, iron-based material and has an iron-exposed region where the iron-based material is exposed and where the joint is formed; an end face of the boss located opposite the joint is positioned flush with an end face of the internal pipe located outside of the hermetic container; the joint is formed by joining the boss to the hermetic container by resistance welding; the external pipe is joined collectively to the internal pipe and the boss by a single copper-brazed joint at the end faces of the boss and the internal pipe positioned flush with each other. a hermetic container made of an iron-based material; a scroll unit accommodated in the hermetic container and driven by an electric motor to perform a series of processes from suction to discharge of a working fluid; and piping configured to allow the working fluid to flow from outside of the hermetic container to the scroll unit or vice versa through a through hole formed through the hermetic container, wherein the piping includes a boss fitted into the through hole from outside of the hermetic container and forming a joint in cooperation with the hermetic container to seal up the through hole, an internal pipe inserted through the boss into the scroll unit, and an external pipe inserted into the internal pipe and projecting from the boss to the outside of the hermetic container, and the joint is formed by joining the boss to the hermetic container by welding, the internal pipe is made of a copper-plated, iron-based material; the external pipe is made of a copper-based material; the boss is made of a copper-plated, iron-based material and has an iron-exposed region where the iron-based material is exposed and where the joint is formed; an end face of the boss located opposite the joint is positioned flush with an end face of the internal pipe located outside of the hermetic container; the joint is formed by joining the boss to the hermetic container by resistance welding; the external pipe is joined collectively to the internal pipe and the boss by a single copper-brazed joint at the end faces of the boss and the internal pipe positioned flush with each other.