Abstract: Provided are a lactic acid bacterium for a lactic acid bacterium-fermented soybean foodstuff, which takes a short fermentation time even when applied to a soybean raw material and has a wide optimal temperature range, and hence can cause curdling in a short period of time even at low temperature, thus being extremely suited for fermentation of the soybean raw material, a lactic acid bacterium-fermented soybean foodstuff comprising the lactic acid bacterium, and a production method for a lactic acid bacterium-fermented soybean foodstuff. The lactic acid bacterium-fermented soybean foodstuff comprises a lactic acid bacterium belonging to Streptococcus thermophilus and having an accession number of NITE BP-02207. The lactic acid bacterium-fermented soybean foodstuff of the present invention is preferably a soybean yogurt lactic acid bacterium-fermented soybean foodstuff.