Abstract: An object of the present invention is to provide a process for producing a sterilized enzymatic decomposition soybean protein with facilitating separation of a precipitate after decomposition of soybean protein with an enzyme, and with improving a yield of the enzymatic decomposition product, thereby minimizing formation of the dregs upon using in drinks and so on. Said process comprises adding a proteolytic enzyme to a soybean protein solution to effect hydrolysis, heating and cooling the hydrolyzation mixture, separating and removing insolubles from the mixture and heat-sterilizing the resultant supernatant.