A steering device for an outboard engine includes: a helm mechanism operable, in response to operation of a steering wheel, to steer the outboard engine and including a drive shaft parallel to an output shaft of the operation member; an electric assist mechanism for detecting steering torque, applied to the steering wheel, to assist operation of the helm mechanism on the basis of the detected steering torque; and a power transmission section for connecting the output shaft of the steering wheel and the helm mechanism to transmit rotation of the output shaft to the helm mechanism.