To provide a low-cost heat insulating pipe having the minimum degree of heat insulating performance.

This heat insulating double pipe has an outer pipe 3, an inner pipe 2 longer than the outer pipe 3 and inserted into the outer pipe 3, end plates 5 respectively provided in both ends of the outer pipe 3 to seal a space between the inner pipe 2 and the outer pipe 3, and an elastic porous body 6 provided in the space between the inner pipe 2 and the outer pipe 3 and compressed to 1/2 or less in volume thereof under the atmospheric pressure.