Disclosed is a slightly denatured, sterilized soybean protein composition. The composition can be produced by sterilizing an aqueous solution of a slightly denatured soybean protein composition which has been salted to such a degree that the ionic strength becomes 0.04 or more, by heating the aqueous solution at a temperature not lower than 60.degree. C. and lower than the denaturation temperature of a soybean protein for 30 minutes or longer.