An electric vehicle includes an inverter unit (22) and an ECU (21). The inverter unit (22) or the ECU (21) includes a magnetic force estimator (38) that estimates a magnetic force of a permanent magnet structure associated with a motor rotor of a motor unit (6). The inverter unit (22) or the ECU (21) may also include a determiner (39) for the estimated magnetic force and an abnormalities-responsive motor drive limiter (40). The estimator (38) is configured to estimate, according to a predefined rule, the magnetic force, based on at least two detection signals selected from a group consisting of a detection signal indicating a rotational frequency of the motor unit (6), a detection signal indicating a motor voltage of the motor unit (6) and a detection signal indicating a motor current of the motor unit (6).