Abstract: The present invention relates to a throttle valve control device for controlling a throttle valve of an engine by an electronic controlled actuator, in which, in order to improve the safety and response speed, first and second driving motors which rotate independently and a driving force conversion mechanism for combining rotational movements of the first and the second driving motors and converting them into a linear movement for transmission are provided to regulate an opening of the throttle valve by the linear movement transmitted from the driving force conversion mechanism and the first and the second driving motors are controlled by control signals from an operation control portion for calculating an optimum opening of the throttle valve.