PURPOSE: To reduce the number of parts by pivotally supporting the output shaft of an actuator on the gear box of gear mechanisms for connecting a control lever to the actuator in the constitution wherein the control lever driven and controlled with the actuator is connected to a control valve spindle.

CONSTITUTION: A lost motion lever 7 is fixed to one end of a throttle spindle 2 having a throttle valve 6 fixed and projected from a throttle body 1, and an operation lever 8 interlocked with accelerator operation is so supported thereon as to be capable of turn. In addition, a control lever 9 controlled with an actuator 52 is fixed to the other end of the aforesaid spindle 2. In the aforesaid control device, the operation lever 9 and the actuator 52 are interlocked via gear mechanisms 54, 49 and 43, and the output shaft 53 of the actuator 52 is pivotally supported on a gear box 102 for housing the gear mechanisms 54, 49 and 43 via a bearing 103.