An electric vehicle comprising: an in-wheel motor drive system including: - a wheel bearing unit ; - a motor unit configured to drive a wheel , the motor unit including a synchronous motor with three-phase motor coils , the three-phase motor coils including a first motor coil, a second motor coil and a third motor coil of different phases, one end of the first motor coil, one end of the second motor coil and one end of the third motor coil being connected with each other at a neutral point in a star connection; and - a reducer unit interposed between the motor unit and the wheel bearing unit ; an ECU which is an electronic control unit configured to perform general control of the vehicle; an inverter unit , the inverter unit including: - a power circuitry including an inverter configured to convert a DC power from a battery unit into an AC power used to drive the motor unit ; and - a motor control circuitry configured to control at least the power circuitry in accordance with control from the ECU ; an abnormal short-circuit monitor configured to detect an abnormal short-circuit of the motor coils ; and an abnormalities-responsive disconnection unit (Es) configured to electrically disconnect the motor coils from the neutral point, wherein the in-wheel motor drive system further including: - a moisture detector (Sk) configured to detect moisture in the motor unit , the moisture detector (Sk) being disposed in proximity to a terminal block associated with the motor unit ; and - a moisture-detection-responsive controller configured to monitor if a moisture detection signal produced from the moisture detector (Sk) meets a defined condition and to, upon determining that the defined condition is met, limit without shutting off a motor current, and wherein the abnormal short-circuit monitor is configured to determine if there is an abnormal short-circuit of the motor coils , based on measurements of supply currents of three phases that flow from the inverter to the motor unit . - a wheel bearing unit ; - a motor unit configured to drive a wheel , the motor unit including a synchronous motor with three-phase motor coils , the three-phase motor coils including a first motor coil, a second motor coil and a third motor coil of different phases, one end of the first motor coil, one end of the second motor coil and one end of the third motor coil being connected with each other at a neutral point in a star connection; and - a reducer unit interposed between the motor unit and the wheel bearing unit ; - a power circuitry including an inverter configured to convert a DC power from a battery unit into an AC power used to drive the motor unit ; and - a motor control circuitry configured to control at least the power circuitry in accordance with control from the ECU ; - a moisture detector (Sk) configured to detect moisture in the motor unit , the moisture detector (Sk) being disposed in proximity to a terminal block associated with the motor unit ; and - a moisture-detection-responsive controller configured to monitor if a moisture detection signal produced from the moisture detector (Sk) meets a defined condition and to, upon determining that the defined condition is met, limit without shutting off a motor current, and <EOS>