To provide a false twisting machine capable of corresponding also to high-mix low-volume production so as to be able to deal with increase of kinds of yarn and processing.

This false twisting machine is equipped with a false twister 36 for applying false twisting to the yarn Y and a heater 31 provided on the upstream side in the traveling direction than the false twister 36 and heating the yarn Y, and the heater 31 is separated into a heater 32 on the upstream side in yarn traveling direction and a heater 33 on the downstream side in the same direction as the heater 32 on the upstream side and yarn guides 34a, 34b, 44a, 44b and 44c are arranged so that the yarn Y can selectively be passed through the heater 32 on the upstream side and the heater 33 on the downstream side or only either one area.