A hybrid type vehicle drive control apparatus comprising: an electric generator (16, 21) that generates electric power by being driven by an engine, an electric generator inverter connected to the electric generator (16, 21); a drive motor that drives a hybrid type vehicle; a drive motor inverter connected to the drive motor, a battery connected to the electric generator inverter and the drive motor inverter; first voltage detection means for detecting a generator inverter voltage applied to the electric generator inverter, second voltage detection means for detecting a drive motor inverter voltage applied to the drive motor inverter, and third voltage detection means for detecting a battery voltage, characterized by system voltage determination processing means comprising detection abnormality determination processing means for determining whether one of the battery voltage, the generator inverter voltage and the drive motor inverter voltage is abnormal based on a first differential voltage and a second differential voltage, the first differential voltage showing a difference in voltage between two voltages of the voltage detected by the first voltage detection means, voltage detected by the second voltage detection means, and the voltage detected by the third voltage detection means 72, and the second differential voltage showing a difference in voltage between either one of the two voltages and the remaining one voltage; the system voltage determination processing means further being arranged for determining a system voltage based on normal voltages of the battery voltage, the generator inverter voltage and the drive motor inverter voltage other than abnormal voltage of the battery voltage, the generator inverter voltage and the drive motor inverter voltage detected by the detection abnormality determination processing means; drive motor control processing means for controlling the drive motor based on the system voltage, the drive motor rotation speed and the target drive motor torque; and generator torque control processing means for controlling generator torque or generator rotation speed based on the system voltage, the generator rotation speed and the target generator torque. an electric generator (16, 21) that generates electric power by being driven by an engine, an electric generator inverter connected to the electric generator (16, 21); a drive motor that drives a hybrid type vehicle; a drive motor inverter connected to the drive motor, a battery connected to the electric generator inverter and the drive motor inverter; first voltage detection means for detecting a generator inverter voltage applied to the electric generator inverter, second voltage detection means for detecting a drive motor inverter voltage applied to the drive motor inverter, and third voltage detection means for detecting a battery voltage, characterized by system voltage determination processing means comprising detection abnormality determination processing means for determining whether one of the battery voltage, the generator inverter voltage and the drive motor inverter voltage is abnormal based on a first differential voltage and a second differential voltage, the first differential voltage showing a difference in voltage between two voltages of the voltage detected by the first voltage detection means, voltage detected by the second voltage detection means, and the voltage detected by the third voltage detection means 72, and the second differential voltage showing a difference in voltage between either one of the two voltages and the remaining one voltage; the system voltage determination processing means further being arranged for determining a system voltage based on normal voltages of the battery voltage, the generator inverter voltage and the drive motor inverter voltage other than abnormal voltage of the battery voltage, the generator inverter voltage and the drive motor inverter voltage detected by the detection abnormality determination processing means; drive motor control processing means for controlling the drive motor based on the system voltage, the drive motor rotation speed and the target drive motor torque; and generator torque control processing means for controlling generator torque or generator rotation speed based on the system voltage, the generator rotation speed and the target generator torque.