To display bioinformation obtained using a sensor of a different standard from that of a certain sensor on a display part of a bioinformation measuring device for processing output signals of the certain standard sensor.

A connector 5A of the sensor 1A of a specific standard is fittable to a connector 6A of a measuring device body 2A, and a connector 7A of a sensor 3A of another standard is fittable to a sensor connector 8A of an external measuring device 4A. An output connector 9A of the external measuring device 4A is fittable to the connector 6A of the measuring device body 2A. When the connector 5A of the sensor 1A is fitted to the connector 6A, the measuring device body 2A finds the bioinformation based on the output signals of the sensor 1A and displays it. When the connector 7A of the sensor 3A is fitted to the connector 8A of the external measuring device 4A and the connector 9A of the external measuring device 4A is fitted to the connector 6A of the measuring device body 2A, the measuring device body 2A finds the bioinformation found by the external measuring device 4A based on the output signals of the sensor 3A and displays it.