The present invention is intended to provide a composition for preventing or improving metabolic syndrome, which is safe and efficiently ingestible. Provided is a composition for reducing blood cholesterol level, improving blood HDL/LDL cholesterol ratio, reducing blood triglyceride level, reducing blood sugar level, controlling increase in liver weight, and/or reducing body weight, the composition containing soybean germ protein as an active ingredient. The composition according to the present invention improves blood cholesterol level, triglyceride, and glucose levels thereby contributing to health promotion.