The invention relates to a steering control device for boats that includes a drive shaft, the rotation of which in one direction or in the opposite direction, by way of a control member, such as a steering wheel or helm mounted or mountable thereon, causes a steering input for an outboard motor or rudder. The steering input is generated by a transmission member, housed into a case, configured to transmit the rotational motion of the shaft to an actuator, associated or associable to the motor or rudder, through a transmission circuit. The device includes a first stationary part configured to be fastened on the bridge of the boat and a second movable part integral with the case of the transmission member. The drive shaft and the transmission member are coupled such that the change in the tilt of the shaft by a given angle causes a change in the tilt of the transmission member by the same angle with a corresponding change in the tilt of the case of the transmission member with respect to the stationary part of the device.