PROBLEM TO BE SOLVED: To provide a repair structure and a repair method of a telescopic device capable of extending the life of a bridge while improving workability, simplifying a work procedure, and reducing a cost. SOLUTION: This is a repair structure of an expansion / contraction device 100 provided with a pair of joint members 110, 110 provided with joint clearances 101 (gap 115) at predetermined intervals in a vehicle passage direction and arranged to face each other, and an upper surface 210a is a joint. The backup material 210 embedded in the gap 115 between the face plates 111 and 111 so as to be lower than or at the same height as the upper surface 111c of the member 110, and the expansion / contraction device straddling between both joint members A coating film waterproof layer 220 formed of a polyurea resin applied to the upper surface is provided. A drainage channel 230 having water stopping property is formed in the gap 115, and rainwater is drained to the shoulder portion provided at the other end in the transverse direction according to the road gradient provided in the transverse direction. [Selection diagram] Fig. 2
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