PROBLEM TO BE SOLVED: To provide an enzyme treatment method for preventing the re-curing of soft retort soybeans and others.SOLUTION: The present invention provides an enzyme treatment softening method for soybeans, where, before an enzyme treatment, raw soybeans are subjected to heat treatment in a soybean pretreatment solution comprising sodium metaphosphate and sodium bicarbonate.SELECTED DRAWING: NoneCOPYRIGHT: (C)2016,JPO&INPIT【課題】特に、軟質レトルト大豆の再硬化を防止するための酵素処理方法を提供する。【解決手段】大豆の酵素処理軟化方法において、酵素処理前に、メタリン酸ナトリウム及び重炭酸ナトリウムを含む大豆前処理溶液で、生大豆を加熱処理する。【選択図】なし