To provide a method for producing an olefinchlorohydrin-based compound capable of making the best use of byproduct hydrogen chloride in the production process without wasting it.

The method for producing the olefinchlorohydrin-based compound is provided, comprising conducting a reaction of an olefin compound with hypochlorous acid obtained by dissolving chlorine in water. This method is characterized by including conducting a reaction of the olefin compound with hydrochloric acid by electrolyzing it formed as a byproduct in forming the hypochlorous acid.