To provide a lining technique and a pig for lining with which an un-cured lining material is easily applied to the inner circumferential face in a desired film thickness in the entire length of the circumference.

A pig B inserted into a pipe A is pulled and moved along the pipe to apply an un-cured lining material C packed in the front side of the pig for lining in the moving direction to the inner circumferential face of the pipe and the lining material is cured to line the pipe with the lining material. During the lining process, while the un-cured lining material in the front side of the pig for lining in the moving direction being scraped upward in the radius direction of the pipe, the pig for lining is pulled and moved to apply the un- cured lining material to the inner circumferential face.