The invention provides a drive control device that comprises: inverters that are connected to a motor; a variable resistive element that is connected between the motor and each of the inverters; a current/voltage detection device connected between the motor and each of the inverters; and a controller that, when detecting a fault of an inverter that drives the motor based on a detection signal from the current/voltage detection device, gradually increases a resistance value of a variable resistive element provided between the faulty inverter and the motor at a velocity of a resistance variation such that a surge voltage has a voltage value for which the variable resistive element and the motor are not damaged, and executes drive control of the motor by a normal inverter other than the faulty inverter.