Turning control device

A turning control device for a vehicle having four wheels that are mechanically separated and steered independently, the four wheels being left and right wheels of a front row and a rear row, the turning control device being configured to control four steering actuators corresponding to the four wheels, the turning control device comprising

• a controller configured to perform feedback control of the four steering actuators to reduce a deviation for each of the four wheels, the deviation being a difference between a state parameter convertible into a turning angle and a target value of the state parameter set according to steering of a steering wheel, wherein
• the controller is configured to execute a responsiveness changing process of changing a responsiveness of the feedback control so that the deviation is likely to be smaller in a vehicle straight traveling state than in a vehicle non-straight traveling state, except when the vehicle satisfies a predetermined application exclusion requirement.