High purity butanol can be manufactured by means of the disclosed butanol manufacturing method which comprises: a manufacturing step (A) wherein a butanol-containing solution is filtered by being passed through a nano-filtration membrane, and the butanol-containing solution is collected from the permeation side; a manufacturing step (B) wherein the butanol-containing solution obtained in step (A) is concentrated by being passed through a reverse osmosis membrane, and separated into two phases, namely a butanol phase and a water phase; and a manufacturing step (C) wherein butanol is collected from the butanol phase obtained in step (B).
