A method of attaching a cover member including a first sheet and a sheet laminate to an inner wall of a circular pipe, wherein the first sheet has a radius of curvature or a flat shape, said radius of curvature being larger than an inner diameter of the circular pipe, wherein the first sheet further has elastic restoring force that restores the radius of curvature or the flat shape, the method comprising: winding and temporarily fixing the first sheet around a cylindrical packer, wherein the cylindrical packer has a radius that is smaller than the inner diameter of the circular pipe and is radially expandable; forming the sheet laminate by adhering a plurality of sheets (1C, 1G, 1R, 2G, 2C, 3G, 3C) together with uncured first resin; winding the sheet laminate around the first sheet, which is wound around the packer, via uncured second resin in order to form the cover member and to temporarily fix the sheet laminate; applying uncured third resin on the cover member that is wound around the packer, and inserting the packer into the circular pipe; pulling the packer by means of a first wire or a second wire and positioning the packer at a predetermined position of the circular pipe, wherein the first and second wires (19, 20) are attached to both axial ends of the packer, respectively; radially expanding the packer at the predetermined position of the circular pipe in order to release temporary fixation of the first sheet and the sheet laminate, and pressing the cover member against the inner wall of the circular pipe via the third resin, whereby when the packer is radially expanded and the temporary fixation is released, the cover member is pressed against the inner wall of the circular pipe due to the elastic restoring force of the first sheet; pulling the packer out of the circular pipe by pulling the first or second wire (19 or 20); and curing the first, second and third resins (22, 23, 24) in order to fix the cover member to the inner wall of the circular pipe. winding and temporarily fixing the first sheet around a cylindrical packer, wherein the cylindrical packer has a radius that is smaller than the inner diameter of the circular pipe and is radially expandable; forming the sheet laminate by adhering a plurality of sheets (1C, 1G, 1R, 2G, 2C, 3G, 3C) together with uncured first resin; winding the sheet laminate around the first sheet, which is wound around the packer, via uncured second resin in order to form the cover member and to temporarily fix the sheet laminate; applying uncured third resin on the cover member that is wound around the packer, and inserting the packer into the circular pipe; pulling the packer by means of a first wire or a second wire and positioning the packer at a predetermined position of the circular pipe, wherein the first and second wires (19, 20) are attached to both axial ends of the packer, respectively; radially expanding the packer at the predetermined position of the circular pipe in order to release temporary fixation of the first sheet and the sheet laminate, and pressing the cover member against the inner wall of the circular pipe via the third resin, whereby when the packer is radially expanded and the temporary fixation is released, the cover member is pressed against the inner wall of the circular pipe due to the elastic restoring force of the first sheet; pulling the packer out of the circular pipe by pulling the first or second wire (19 or 20); and curing the first, second and third resins (22, 23, 24) in order to fix the cover member to the inner wall of the circular pipe.