To provide a double-pipe connection structure for a storage container that achieves simplification of assembly and disassembly of a double-pipe connection structure while simplifying the structure by eliminating a short pipe.

An inner pipe 2 is divided on the same plane as the flange surface of a storage container 1 or near it. A body-side inner-pipe flange 22 is formed at the end of the inner pipe arranged closer to the container inside than the divided end surface. A circumscribed-side inner-pipe flange 21 is formed at the end of the inner pipe, arranged on the container outside, oppositely to the body-side inner-pipe flange 22. An outer-pipe flange 31 is formed at the end of an outer pipe arranged on the container outside so as to be fastenable to the flange surface of the storage container. When the outer-pipe flange 31 is fastened to the flange surface of the storage container 1, the outer-pipe flange 31, the body-side inner-pipe flange 22, and the circumscribed-side inner-pipe flange 21 are joined together by fastening the three flanges together by a bolt fastening force so as to allow an inner-pipe passage 5 to fluid-tightly communicate with an outer-pipe passage 6.