To provide a method for producing vinegar, which can effectively suppress the generation of slag without damaging the quality.

A method for producing vinegar includes a slag suppression step of suppressing slag generating in vinegar. In the slag suppression step, a direct current is applied to a fermentation liquid after the completion of acetic acid fermentation under a condition that the amount of electric energy per unit volume is ≥0.1 Joule/cm³ and ≤10 Joule/cm³ and under an unheated condition.