To prevent a driver of a vehicle from being suddenly taken ill during driving as much as possible.

This biological information communication system is provided with a vehicle-side processor provided in the vehicle, and a portable machine worn on the driver. The vehicle-side processor transmits a request signal when the driver gets therein (steps S1 and S2), the portable machine, when receiving the request signal, measures the blood pressure and the pulse of the driver, determines whether the values are normal or abnormal, and transmits the determination result and an ID code thereto (step T1 or T4), the vehicle-side processor, when receiving the determination result and the ID code from the portable machine and if the ID code is accorded with the own ID code and the determination result is normal, starts the engine (Step S3 or S7), however, if the determination result is abnormal, non-starts the engine and allows an alarm to notify, "You cannot drive because you have a possibility of the onset of an acute disease".