The present invention provides a biological information monitoring system capable of determining a physical abnormality at its earliest stage with higher accuracy than conventional methods by detecting biological information at multiple positions of the body of a subject. The biological information monitoring system according to the invention comprises a plurality of biological information sensor modules to be attached to at least one set of positions of upper and lower bodies, upper and lower extremities, ventral and dorsal surfaces, complementary upper and lower parts and complementary front and back parts of the body of a subject, which biological information sensor modules each incorporate a biological information sensor for detecting the biological information and a wireless-enabled communication means capable of communicating the biological information, in which a determination means for determining an abnormality by comparing the biological information detected by the biological information sensor incorporated in one of the biological information sensor modules itself with another biological information received by the communication means in the other biological information sensor module.