PURPOSE: To obtain anion exchange fibers having improved fiber properties without falling of a polymer at the same time, by containing a polymer having amino groups in a dehydration product of PVA oriented in the fiber axis direction and insolubilizing the polymer in water.

CONSTITUTION: (A) A polymer having amino groups, e.g. polyethyleneimine, etc., and (B) PVA, preferably having ≥95mol% saponification degree and 1,000W2,000 polymerization degree are subjected to blend spinning and dehydration reaction of the polymer (A) is carried out in the presence of a strong acidic substance, e.g. hydrogen chloride gas, etc., to afford the aimed anion exchange fibers. The blending ratio of the components (A) to (B) is preferably 1/4W1/1.