False-twist texturing method

The present invention relates to a false-twist texturing method of a yarn including poly lactic acid fiber (PLA) which is manufactured from poly lactic resin of which the raw material is the lactic acid obtained from starch of the corn or the like. According to the false-twist texturing method of the yarn including poly lactic acid fiber, the false-twisting device is made to be a nip typed false-twisting device and the heating temperature by the first heater is made to be lower than or equal to 130° C. The false-twist texturing method of the present invention is capable of eliminating the yarn breakage of the poly lactic acid fiber which is weak against the friction and the heat, due to the twisting by the false-twisting device and the heating by the first heater.