A vehicle occupant detection device according to an embodiment of the present invention is provided. The vehicle occupant detection device includes a sensor unit disposed in a vehicle to detect biometric information of an occupant located in a front seat of the vehicle and a rear seat of the vehicle, a control unit analyzing the biometric information measured by the sensor unit, and an output unit outputting a warning message on the basis of the information analyzed by the control unit, wherein the control unit determines that the occupant located in the rear seat is in a dangerous state when the biometric information is not detected in the front seat but detected in the rear seat.
