Japanese Patent Laying-Open No. 2010-81682 (PTD 1) discloses a motor drive control apparatus including an inverter which is capable of driving a motor by selectively using a PWM (Pulse Width Modulation) voltage and a rectangular-wave voltage, and a voltage boost converter which is capable of boosting an inverter voltage relative to a battery voltage. In this motor drive control apparatus, a map to be used for setting a target post-boost voltage for a motor MG2 is generated in advance. This map defines a relationship between the rotational speed and a torque command value and a target post-boost voltage for motor MG2, which is a target value of the post-boost voltage. This map is used to derive a target post-boost voltage corresponding to a target operating point of motor MG2. By way of example, the map to be used for setting a target post-boost voltage for motor MG2 is generated in such a manner that makes a loss of a motor drive system as small as possible at each motor MG2's operating point in a voltage boost region and that defines a target value of the post-boost voltage which can cancel an induced voltage at that operating point (see PTD 1).