The present invention relates to a steering system for a watercraft, comprising: a rudder, in particular an outboard motor (12); a steering device (16) including an actuator, in particular an electric motor (20) configured to change a direction in which the watercraft travels; a steering amount input means, such as a steering wheel (17), operable by an operator, electrically connected to the actuator (20) to provide an actuation signal corresponding to the amount of a steering operation to the actuator (20); a reaction actuator, such as a reaction motor (29) for applying a reaction force to the steering amount input device (17); and control means (33) for controlling the reaction actuator (29), the control means (33) including: at least one of operation status detection means (38) for detecting an operation status corresponding to the steering operation, running status detection means (39) for detecting a running status of the watercraft, watercraft propulsion unit status recognition means (40) for recognizing a status of a watercraft propulsion unit, in particular of an outboard motor (12), such as the installation number thereof, and actuator status detection means (41) for detecting a status of the actuator (20); torque computation means (42) for computing a torque target value based on the detection value from the at least one of the detection and recognition means; and reaction actuator control means (43) for controlling the reaction actuator (29) in accordance with the torque target value.