A soy saponin composition is provided high bodily absorption characteristics. In an embodiment, a soyasapogenol composition comprises soyasapogenol B and 3-O-D-glucuronopyranosyl soyasapogenol B. The weight ratio (B/A) of the 3-O-D-glucuronopyranosyl soyasapogenol B to the soyasapogenol B is in the range of 0.001-10. The composition can be produced by partial decomposition of a sugar chain residue of a soy saponin B group glycoside utilizing an acid.