PROBLEM TO BE SOLVED: To provide a repairing method in a pipe conduit which can repair the bottom of the pipe conduit efficiently. SOLUTION: In this repairing method, long size profiles 2 made of a resin which are formed in a long size band form having junction ribs and junction grooves at both side edges are fed continuously in a pipe conduit 1, and at the same time, the neighboring junction ribs and junction grooves of the long size profiles 2 are jointed while winding them in a spiral form, so as to form spiral pipes 21 in the pipe conduit 1, the spiral pipes 2a are cut off along the longitudinal direction to expand them on the bottom 10 in the pipe conduit 1, repairing backings 20 formed of the long size profiles 2 are set and fixed from one side edge to the other side edge of the bottom 10, and a backing agent is filled and hardened at the clearance between the bottom 10 and the repairing backing 20 in the pipe conduit 1, in the condition holding the repairing backing 20 in the pipe conduit 1.
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