A motor drive control device that drives and controls a motor by using a PWM inverter includes a dead time compensation portion that obtains a compensation amount to compensate for an error of an output voltage of the PWM inverter generated when a dead time to avoid simultaneous turning-on of respective switching elements mutually connected in series in the PWM inverter is prepared and outputs a voltage command obtained by taking the compensation amount into account to the PWM inverter. The dead time compensation portion obtains the compensation amount based on a magnitude of a current command vector indicating a vector of a current to be followed by a current flowing through the motor. The current command vector is a vector defined by a coordinate system in synchronism with a rotor of the motor or its equivalent coordinate system.