A steering system comprising: a steering operation mechanism mechanically decoupled from a steering wheel and configured to steer steered wheels using a first actuator; a second actuator configured to rotate the steering wheel via a steering shaft; a steering angle sensor configured to detect a steering angle of the steering wheel; a steering torque sensor configured to detect steering torque that acts on the steering shaft; and a steering operation control device configured to control a steered angle using a steered angle command value to be provided to the first actuator, wherein the steering operation control device is configured to execute a first process, a second process, a third process, a fourth process, a fifth process, and a sixth process, the first process being a process of receiving a first target steered angle for drive assist from outside the steering operation control device, the second process being a process of driving the second actuator in accordance with a steering angle command value obtained by converting the first target steered angle into a steering angle, the third process being a process of computing a second target steered angle obtained by converting an actual steering angle detected by the steering angle sensor into a steered angle, the fourth process being a process of setting the first target steered angle as a final target steered angle when a magnitude of actual steering torque detected by the steering torque sensor is equal to or less than a threshold, and using at least the second target steered angle in setting the final target steered angle when the magnitude of the actual steering torque is more than the threshold, the fifth process being a process of determining the steered angle command value based on the final target steered angle, and the sixth process being a process of varying a magnitude of the threshold in accordance with a drive force acting on the steering shaft from the second actuator due to steered wheel operation by the drive assist. a steering operation mechanism mechanically decoupled from a steering wheel and configured to steer steered wheels using a first actuator; a second actuator configured to rotate the steering wheel via a steering shaft; a steering angle sensor configured to detect a steering angle of the steering wheel; a steering torque sensor configured to detect steering torque that acts on the steering shaft; and a steering operation control device configured to control a steered angle using a steered angle command value to be provided to the first actuator, wherein the steering operation control device is configured to execute a first process, a second process, a third process, a fourth process, a fifth process, and a sixth process, the first process being a process of receiving a first target steered angle for drive assist from outside the steering operation control device, the second process being a process of driving the second actuator in accordance with a steering angle command value obtained by converting the first target steered angle into a steering angle, the third process being a process of computing a second target steered angle obtained by converting an actual steering angle detected by the steering angle sensor into a steered angle, the fourth process being a process of setting the first target steered angle as a final target steered angle when a magnitude of actual steering torque detected by the steering torque sensor is equal to or less than a threshold, and using at least the second target steered angle in setting the final target steered angle when the magnitude of the actual steering torque is more than the threshold, the fifth process being a process of determining the steered angle command value based on the final target steered angle, and the sixth process being a process of varying a magnitude of the threshold in accordance with a drive force acting on the steering shaft from the second actuator due to steered wheel operation by the drive assist.