A vehicle steering device, which includes a right steering operation mechanism that steers a right steered wheel and a left steering operation mechanism that steers a left steered wheel, and in which a steering member that is operated to steer a vehicle is mechanically coupled to neither the right steering operation mechanism nor the left steering operation mechanism, the right steering operation mechanism being driven by a right steering motor, and the left steering operation mechanism being driven by a left steering motor, the vehicle steering device comprising: a higher-level control device that sets a right target steered angle (δ R *) and a left target steered angle (δ L *), the right target steered angle (δ R *) being a target value for a steered angle of the right steered wheel, and the left target steered angle (δ L *) being a target value for a steered angle of the left steered wheel; a left steering control device that drivingly controls the left steering motor; and a right steering control device that drivingly controls the right steering motor, characterized in that the left steering control device includes a first mode switching unit that switches a control mode between a first control mode and a second control mode, the first control mode being a mode in which the left steering control device controls the left steering motor so that the steered angle of the left steered wheel becomes equal to the left target steered angle (δ L *) received from the higher-level control device, and the second control mode being a mode in which the left steering control device controls the left steering motor by torque feedback control so that the steered angle of the left steered wheel becomes equal to an angle corresponding to a neutral position of the left steered wheel, the first mode switching unit includes a unit that normally sets the control mode to the first control mode and that switches the control mode to the second control mode when abnormal communication occurs between the higher-level control device and the left steering control device, the right steering control device includes a second mode switching unit that switches a control mode between a third control mode and a fourth control mode, the third control mode being a mode in which the right steering control device controls the right steering motor so that the steered angle of the right steered wheel becomes equal to the right target steered angle (δ R *) received from the higher-level control device, and the fourth control mode being a mode in which the right steering control device controls the right steering motor by torque feedback control so that the steered angle of the right steered wheel becomes equal to an angle corresponding to a neutral position of the right steered wheel, and the second mode switching unit includes a unit that normally sets the control mode to the third control mode and that switches the control mode to the fourth control mode when abnormal communication occurs between the higher-level control device and the right steering control device. a higher-level control device that sets a right target steered angle (δ R *) and a left target steered angle (δ L *), the right target steered angle (δ R *) being a target value for a steered angle of the right steered wheel, and the left target steered angle (δ L *) being a target value for a steered angle of the left steered wheel; a left steering control device that drivingly controls the left steering motor; and a right steering control device that drivingly controls the right steering motor, characterized in that the left steering control device includes a first mode switching unit that switches a control mode between a first control mode and a second control mode, the first control mode being a mode in which the left steering control device controls the left steering motor so that the steered angle of the left steered wheel becomes equal to the left target steered angle (δ L *) received from the higher-level control device, and the second control mode being a mode in which the left steering control device controls the left steering motor by torque feedback control so that the steered angle of the left steered wheel becomes equal to an angle corresponding to a neutral position of the left steered wheel, the first mode switching unit includes a unit that normally sets the control mode to the first control mode and that switches the control mode to the second control mode when abnormal communication occurs between the higher-level control device and the left steering control device, the right steering control device includes a second mode switching unit that switches a control mode between a third control mode and a fourth control mode, the third control mode being a mode in which the right steering control device controls the right steering motor so that the steered angle of the right steered wheel becomes equal to the right target steered angle (δ R *) received from the higher-level control device, and the fourth control mode being a mode in which the right steering control device controls the right steering motor by torque feedback control so that the steered angle of the right steered wheel becomes equal to an angle corresponding to a neutral position of the right steered wheel, and the second mode switching unit includes a unit that normally sets the control mode to the third control mode and that switches the control mode to the fourth control mode when abnormal communication occurs between the higher-level control device and the right steering control device.