Steering mechanism for outdrive device, and vessel provided with steering mechanism for outdrive device

The present invention addresses the problem of providing a steering mechanism for an outdrive device, the steering mechanism capable of changing the mounting position of an actuator according to structures disposed therearound and the shape of a hull. A steering mechanism (100) for an outdrive device is provided with an outdrive device (10), an actuator (20) which rotates the outdrive device (10), and a bracket (30) which supports the actuator (20), the bracket (30) has arm parts (31) on both right and left sides with a position where the outdrive device (10) is located in the middle of a helm as a center, and the actuator (20) is mountable to either of the arm parts (31) of the bracket (30).