The main purpose of this invention is to provide a simple and effective method of manufacturing plant tissues of "processed beans and so on" containing abundant cell tissues without using enzyme such as pectinase, which makes possible that dispersing cells of plant tissues of "beans and so on" as single cells without destruction of cell membrane, can maintain intracellular nutrients of plant tissues of "beans and so on" in the cell, and a smell characteristic to plant tissues of "beans and so on" is hardly present. That is, this invention relates to a method of manufacturing plant tissues of processed beans and so on in which single cells of plant tissues of beans and so on are dispersed wherein a soaking step in which the plant tissues of beans and so on are soaked in water, a pressurization and a heating step in which the soaked plant tissues of beans and so on are pressured and heated in the presence of water, and a fine crushing step in which the pressured and heated plant tissues of beans and so on are crushed finely at a temperature of more than 30.degree. C.