A winding machine for forming a rehabilitating pipe by using a plastic strip, comprising: a frame configured to be installed inside an existing pipe, a joining mechanism for joining a plastic strip, and a support for supporting the joining mechanism on an inner surface of the existing pipe, wherein the plastic strip is an elongated material that comprises joint portions and that is formed into a tubular shape by the joint portions arranged adjacent to each other by being helically wound and joined by the joining mechanism, wherein the frame comprises a plurality of rotatable rollers, and is capable of orbiting along the inner surface of the existing pipe, wherein the joining mechanism that is provided in the frame and that comprises an inner roller and an outer roller is configured to sandwich the plastic strip from inside and outside, wherein the support is rotatable in contact with the inner surface of the existing pipe, and comprises a rotational shaft thereof at a position different from positions of rotational shafts of the inner roller and the outer roller, wherein the joining mechanism comprises a drive unit and a fit unit, the drive unit and the fit unit each independently comprise an inner roller (42, 42) and an outer roller (43, 43), wherein the drive unit is configured to cause the joining mechanism to orbit along the inner surface of the existing pipe, and wherein the fit unit is configured to join the joint portions of the plastic strip with each other, the frame and the joining mechanism are configured to orbit along the inner surface of the existing pipe, and the support is configured to be rotated in contact with the inner surface of the existing pipe, whereby the outer rollers can be maintained separated from the inner surface of the existing pipe and wherein the drive unit comprises a first portion where the inner roller and the outer roller are configured not to sandwich a newly supplied plastic strip whose joint portions have not been joined, and a second portion where the inner roller and the outer roller are configured to sandwich the plastic strip whose joint portions have been joined, and the joining mechanism is configured to be orbited by reactive force by which the second portion is configured to sandwich and send out the plastic strip. a frame configured to be installed inside an existing pipe, a joining mechanism for joining a plastic strip, and a support for supporting the joining mechanism on an inner surface of the existing pipe, wherein the plastic strip is an elongated material that comprises joint portions and that is formed into a tubular shape by the joint portions arranged adjacent to each other by being helically wound and joined by the joining mechanism, wherein the frame comprises a plurality of rotatable rollers, and is capable of orbiting along the inner surface of the existing pipe, wherein the joining mechanism that is provided in the frame and that comprises an inner roller and an outer roller is configured to sandwich the plastic strip from inside and outside, wherein the support is rotatable in contact with the inner surface of the existing pipe, and comprises a rotational shaft thereof at a position different from positions of rotational shafts of the inner roller and the outer roller, wherein the joining mechanism comprises a drive unit and a fit unit, the drive unit and the fit unit each independently comprise an inner roller (42, 42) and an outer roller (43, 43), wherein the drive unit is configured to cause the joining mechanism to orbit along the inner surface of the existing pipe, and wherein the fit unit is configured to join the joint portions of the plastic strip with each other, the frame and the joining mechanism are configured to orbit along the inner surface of the existing pipe, and the support is configured to be rotated in contact with the inner surface of the existing pipe, whereby the outer rollers can be maintained separated from the inner surface of the existing pipe and wherein the drive unit comprises a first portion where the inner roller and the outer roller are configured not to sandwich a newly supplied plastic strip whose joint portions have not been joined, and a second portion where the inner roller and the outer roller are configured to sandwich the plastic strip whose joint portions have been joined, and the joining mechanism is configured to be orbited by reactive force by which the second portion is configured to sandwich and send out the plastic strip.