Abstract: The biological information measuring system of this invention applies rectangular voltage pulses across at least a pair of electrodes attached to the surface of a living body, obtains, through the analysis of a transient current flowing across electrodes, current waveform parameters representing an equation approximating the waveform of the transient current, and calculates equivalent circuit parameters representing an electrical equivalent circuit across the electrodes. Using at least one type of these parameters as biological information, abnormality of the living body is detected.