To provide a method of repairing a tunnel internal sheet mounting section easily in a short time which does not make useless the mounted internal sheet and does not contaminate an environment due to the disposal of the existing sheet.

The vertical surface 10 side of a first repair member 1 formed so as to have two surfaces of generally L-shapes in cross section is applied to front surfaces 55 of both internal sheets 50, 50. An angle bar 2 and the vertical surface 10 of the first repair member 1 brought into contact with rear surfaces 56 of both internal sheets 50, 50 are tightened to each other with bolts and nuts 7 at a gap 66. With the vertical edges 53, 54 of both internal sheets 50, 50 held between the angle bar 2 and the vertical surface 10, both the internal sheets 50, 50 are connected and fixed to each other. A mounting seat 14 at the lateral surface 13 side of a second repair member 3 is fixed to an anchor bolt 6 driven in a tunnel wall surface 60, a mounting seat 18 and a retaining metal fitting 4 are tightened with bolts and nuts 8 at the gap 66, and with the vertical edges 53, 54 of both the internal sheets 50, 50 held between the mounting seat 18 and the retaining metal fitting 4, both the internal sheets 50, 50 are connected and fixed to each other, and fixed to the tunnel wall surface 60.

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