A control apparatus for a motor generator in a vehicle includes a first control unit that determines a target torque using a redundant signal and a non-redundant signal, a monitoring unit that determines a monitoring target torque using the redundant signal, and a fail-safe determining unit. The fail-safe determining unit determines the execution of first fail-safe processing when a difference between the target torque and the monitoring target torque is equal to or more than a predetermined first upper limit threshold value or equal to or less than a first lower limit threshold value, and determines the execution of second fail-safe processing when the difference is equal to or more than a predetermined second upper limit threshold value which is smaller than the first upper limit threshold value or equal to or less than a second lower limit threshold value which is smaller than the first lower limit threshold value.