To provide a technique capable of adjusting a tilt angle of a ship propulsion machine body with respect to a hull to a tilt angle suitable for a travelling state easily and with high accuracy. A motor adjusting a tilt angle of a ship propulsion machine body with respect to a hull and a control device controlling drive of the motor so as to change the tilt angle in accordance with an output from a hull angle sensor detecting a hull angle as an angle of the hull with respect to the water surface are included.