A connecting structure includes a high-pressure line having a load-bearing shell and a sealing inner cladding, as well as a coupling, which coupling includes a flange section having a ring part and a flange which extends radially outwards with respect to the ring part, a connecting element by which the load bearing shell of a pipe is connected to the flange section, as well as a sealing element which the inner cladding of the high-pressure line is connected to the flange section, which sealing element end in the free end of the flange section which is turned away from the high-pressure line. The sealing element includes a sealing sleeve which is situated between the inner cladding of the pipe and the ring part of the flange section.