To provide a terrestrial heat exchanging device arranging a metallic pipe being a flow passage of a heat medium in a metallic buried pipe buried in the ground and capable of preventing electric corrosion by the contact of the metallic pipe with the inner face of the metallic buried pipe to prolong a service life by a simple configuration and the reduction of cost.

This terrestrial heat exchanging device has the metallic buried pipe 1 buried in the ground and the metallic pipe 2 arranged in the buried pipe 1 and being the flow passage of heat medium. A non-electrical conductive separator 3 is provided between the pipe 2 and the inner face of the buried pipe 1 to prevent the pipe 2 from coming into contact with the inner face of the buried pipe 1.