To produce a pile fabric having soft texture and low shrinkability by using a false twist yarn.

The false twist yarn is composed of single fibers including a polyester component consisting mainly of polytrimethylene terephthalate. The false twist yarn satisfies all of the following requirements: (1) the degree of shrinkage by wet heat treatment at 98°C for 20 min is ≤5%; (2) the ratio of the stretch elongation (TS) after the dry-heat treatment at 90°C for 15 min to the stretch elongation (WS) after the wet-heat treatment at 90°C for 20 min (TS/WS) is 0COPYRIGHT: (C)2008,JPO&INPIT