In a vehicle steering system configured to reduce the burden placed on an operator when steered wheels are returned to a neutral position, a knob for operating a steering wheel is turnably attached to the steering wheel. A switch is attached to the knob. A steered system ECU includes a target steered angle setting unit. The target steered angle setting unit changes a target steered angle to a steered angle corresponding to a position closer to the neutral position of the steered wheels when the switch is turned on in a state where the turning amount of the steering wheel from a turning angle of the steering wheel corresponding to the neutral position of the steered wheels is within a prescribed range.