A device for measuring blood alcohol concentration for detecting the alcohol concentration from the blood of the unconscious driver as well as the driver's breath, comprises a first body including a coupling recess into which the blood collection module is coupled and a heater for heating the coupled blood collection module, and a second body including a detection probe to penetrate the blood collection module to suck the alcohol gas in the blood collection module, and an alcohol detection sensor to detect the alcohol concentration through the alcohol gas introduced through the detection probe.
