Control apparatus of multiple ship propellers

A control apparatus of multiple ship propellers controlling operation states of at least two ship propellers attached to a transom and transmitting and receiving operation information of the respective ship propellers mutually via a communication member, and configured to give a thrust difference between the ship propellers in the event of a fault of an electric rudder tilter used to turn a ship by turning a rudder by controlling thrusts of the respective ship propellers according to a detection value of a steering angle detector that detects a steering angle,

• wherein when a sailing direction of the ship is controlled by the thrust difference, the control apparatus controls the respective ship propellers by using a steering angle threshold up to which the thrust difference is not given between the ship propellers in a region in which the steering angle is small, and in a case where the steering angle exceeds the steering angle threshold, by using a predetermined value of the thrust difference with which the thrust difference is given between the ship propellers.