The present invention relates to corrugated thermostable hollow fiber membranes of reduced wall thickness, wherein the wall thickness reaches 20 μm or more and 30 μm or less, and the corrugation of the hollow fiber membrane is greater than 1 mm and It shows wavelengths in the range of less than 5 mm. In particular, the invention relates to a method of producing corrugated thermostable hollow fiber membranes with thinner wall thickness. [Selection diagram] Figure 2本発明は、減少した壁厚の波状熱安定性中空繊維膜に関連し、壁厚は、20μm又はそれよりも大きくかつ30μm又はそれ未満に達し、中空繊維膜の波形は、1mmよりも大きくかつ5mm未満の範囲の波長を示す。特に、本発明は、より薄い壁厚の波状熱安定性中空繊維膜を生成する方法に関する。【選択図】図2