Provided is a practical biological information measuring apparatus that is compact, provides minimal inconvenience worn on the body, and has an extended battery life, the biological information measuring apparatus being capable of instantly displaying a heartbeat interval. A biological information measuring apparatus capable of measuring at least a heartbeat interval of a living body and capable of being attached to a living body, the biological information measuring apparatus characterized in comprising: a plurality of electrodes that come in contact with the living body signal processing means for electrically processing a change in voltage obtained from the electrodes and creating an electrocardiogram signal heartbeat interval measuring means for measuring, from the electrocardiogram signal, a heartbeat interval from an interval between one R wave and another adjacent R wave or an interval between one S wave and another adjacent S wave in the electrocardiogram signal triaxial acceleration measuring means and temperature measuring means the biological information measuring apparatus further comprising wireless transmission means for simultaneously and wirelessly transmitting the heartbeat interval obtained by the heartbeat interval measuring means, the triaxial acceleration obtained by the triaxial acceleration measuring means, and the temperature obtained by the temperature measuring means.
