PROBLEM TO BE SOLVED: To provide a technique of producing a concentrated fermented milk while suppressing a rise in acidity, which is suitable for producing a concentrated fermented milk comprising a non-acidic material.SOLUTION: A method for producing a concentrated fermented milk has a fermentation step for fermenting a prepared milk liquid to prepare a fermented product, and a concentration step for concentrating the prepared fermented product to prepare a concentrated fermented milk. Before the concentration step, a dilution step is included in which the fermented product is diluted with a diluent to prepare a diluted fermented product.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】非酸性素材を含む濃縮発酵乳を製造するのに好適な、酸度の上昇を抑制しながら濃縮発酵乳を製造する技術を提供する。【解決手段】調乳液を発酵して発酵物を調製する発酵工程と、調製した発酵物を濃縮して濃縮発酵乳を調製する濃縮工程とを含む、濃縮発酵乳の製造方法において、前記濃縮工程の前に、前記発酵物を希釈液により希釈して希釈発酵物を調製する希釈工程を含む。【選択図】なし