Steering device for vehicle

A steering device for vehicle, comprising:

• an operating member operated by being rotated;
• a steering actuator driven in accordance with operation of said operating member;
• means for transmitting the movement of said steering actuator to wheels of the vehicle such that steering angle changes in accordance with said movement without mechanically coupling said operating member to the wheels;
• an operating actuator for generating control torque, which acts on said operating member;
• means for determining load torque, which is sum of said control torque and operating torque exerted on said operating member by a driver;
• a sensor for determining operating angle of the operating member which is operated by the action of said load torque;
• means for computing target behavior index value of the vehicle, comprising at least target yaw rate corresponding to said determined load torque and operating angle, based on a stored relationship between said load torque, operating angle and target behavior index value;
• a sensor for determining a value, comprising at least yaw rate of the vehicle, as a behavior index value corresponding to change of behavior of the vehicle;
• means for controlling said steering actuator such that said determined behavior index value follows said target behavior index value;
• means for computing target operating angle of said operating member corresponding to said determined behavior index value, based on a stored relationship between said behavior index value and target operating angle;
• and
• means for controlling said operating actuator such that said determined operating angle follows said computed target operating angle.