A proliferation of Bulgarian bacteria is relatively promoted, and growth of Thermophilus bacteria is relatively inhibited.SOLUTION: The process for producing fermented milk according to the present invention comprises a starter adding step of adding a lactic acid bacteria starter containing Bulgarian bacteria and thermophilus bacteria to raw milk to obtain a fermented milk base material, a step of adding acidity of the fermented milk base material An acidity adjusting step of adjusting the pH to 0.2% or more, and a fermentation step of fermenting the fermented milk base material after the acidity adjusting step to obtain fermented milk. This makes it possible to relatively promote the growth of Bulgarian bacteria without using additives such as lactobacillus growth promoting agent and therefore produces fermented milk containing no polysaccharide derived from Bulgaria bacteria be able to.(FIG.【解決課題】 ブルガリア菌の増殖を相対的に促進し,サーモフィルス菌の増殖を相対的に抑制する。【解決手段】 本発明に係る発酵乳の製造方法は,原料乳にブルガリア菌及びサーモフィルス菌を含む乳酸菌スタータを添加して発酵乳基材を得るスタータ添加工程と,発酵乳基材の酸度を0.2%以上に調整する酸度調整工程と,酸度調整工程後の発酵乳基材を発酵させて発酵乳を得る発酵工程と,を含む。これにより,乳酸菌の増殖促進剤などの添加物を用いずに,ブルガリア菌の増殖を相対的に促進することができるため,ブルガリア菌由来の多糖体を多く含む雑味のない発酵乳を製造することができる。【選択図】図1
