Provided are a production method for an edible fermented dairy product using, as a raw material, sterile full fat soy flour, which has a very high nutritional value and has a markedly improved taste evaluation that includes flavor and smooth texture, and a fermented dairy product produced by the method. A production method for a fermented dairy product includes the steps of: producing sterile full fat soy flour having a grain size of from 100 to 1,000 meshes by pulverizing sterile dehulled soybeans prepared so as to have a bacterial count of 300 cells/g or less by using a method of separating whole soybeans into cotyledons, germs, and hulls; adding water to the sterile full fat soy flour to prepare a powdered soy juice, followed by sterilizing the powdered soy juice by heating; homogenizing the powdered soy juice to prepare a homogenized powdered soy juice; and adding a lactic acid bacterium to the homogenized powdered soy juice, followed by fermentation to prepare fermented milk.
