Abstract: The present invention provides a process for producing wort with reduced content of a stale flavor-causing substance for the purpose of producing fermented alcoholic beverages such as beer and the like, in which the generation of a stale flavor is suppressed, and to provide a process for producing fermented alcoholic beverages such as beer and the like, in which the generation of a stale flavor is suppressed by using the wort obtained by said process. It becomes possible to produce fermented alcoholic beverages such as beer and the like, in which the generation of a stale flavor is suppressed, as a result of reducing a stale flavor-causing substance in wort by adjusting the grist fineness of a cereal raw material that are used for producing fermented alcoholic beverages such as beer and the like, i.e. by grinding the grains of a cereal raw material more coarsely than usual.