To reduce tire wear, a turning motion assistance device for an electric vehicle is provided which includes a target wheel slip angle calculating unit for calculating a target wheel slip angle from the steering angle, a vehicle state quantity detector for detecting vehicle state quantities, an actual vehicle-body slip angle calculating unit for calculating an actual vehicle-body slip angle from the vehicle state quantities, an actual wheel slip angle calculating unit for calculating an actual wheel slip angle from the actual vehicle-body slip angle and the steering angle, a yawing moment requirement calculating unit for calculating a yawing moment requirement from a difference between the target wheel slip angle and the actual wheel slip angle, and a torque correction data calculating unit for calculating an amount of torque correction for generating the yawing moment required.