It is an object of the present invention to provide a biological information measurement system that can reliably detect odiferous gas discharged from a test subject. The present invention is a system (1) that measures physical condition of a test subject on the basis of defecation gas, and has a suction device (18) that sucks gas in a bowl (2a), a gas detector (20) provided with a gas sensor (26) that is sensitive to methyl mercaptan gas included in the sucked defecation gas, a control device (22) that controls the suction device and the gas detector, a data analyzer (60) that analyzes the physical condition of the test subject, and an output device (68) that outputs an analysis result, and the data analyzer is provided with noise suppression means that suppresses influence of noise caused by the test subject, other than discharge of defecation gas of the test subject.