PURPOSE: To manufacture the titled fiber having extremely high Young's modulus, without lowering the strength, by extruding a concentrated solution of an aromatic polyamide in air and wet-spinning the fiber, wherein the spinning is carried out under a specific take-up tension defined by the acid content of the coagulated fiber.

CONSTITUTION: A polymer of poly-p-phenylene terephthalamide composed mainly of the structural unit of formula is dissolved in a ≥98wt% concentrated sulfuric acid, chlorosulfuric acid, fluorosulfuric acid or their mixture to obtain an anisotropic dope. The dope is extruded into a non-coagulating phase, passed through a coagulating phase, and taken up under a tension of 1.0W4.0g/d keeping the weight ratio of the acid in the obtained coagulated fiber to the polymer in the fiber to 0.1W0.8. The intrinsic viscosity of the poly-p-phenylene terephthalamide is preferably ≥5.1, and the polymer concentration is preferably ≥14wt%.