The present invention relates to an automatic 
cardiopulmonary resuscitation (CPR) device which, even in the middle of performing 
cardiopulmonary resuscitation, can measure an electrocardiogram and 
oxygen saturation, can measure an electroencephalogram so as to detect in real time a brain activity indicative of the degree of 
blood circulation in the brain, has a 
defibrillation function, can use a brain 
activity index as a CPR 
signal indicating the degree of 
cardiopulmonary resuscitation, and can remotely monitor biometric signals at a pre-hospital stage. The present invention provides a cardiopulmonary 
resuscitation device comprising: an electroencephalogram detection unit for detecting an electroencephalogram 
signal from the 
frontal lobe; and a calculation 
processing unit for detecting a brain 
activity index, which is used as a CPR 
signal indicating the degree of cardiopulmonary 
resuscitation, from the electroencephalogram signal received from the electroencephalogram detection unit, wherein the calculation 
processing unit derives, as the brain 
activity index, one or more of the burst suppression ratio (BSR), the beta ratio, and the SynchFastSlow (relative synchrony of fast and slow wave, SFS). The calculation 
processing unit eliminates 
noise from the electroencephalogram signal received from the electroencephalogram detection unit, and derives the beta ratio from the electroencephalogram signal, from which 
noise has been eliminated, using the following formula: Beta Ratio = log[spectral power (30-47 Hz) / spectral power (11-20 Hz)] (where, spectral power (30-47 Hz) denotes the spectral power in the 30-47 Hz band of the electroencephalogram, and spectral power (11-20 Hz) denotes the spectral power in the 11-20 Hz band of the electroencephalogram).