PURPOSE:To diminish car speed fluctuation by constituting a control unit capable of making automatic correction of the initial operation time of an actuator in response to the inclination of a car body when the set car speed for steady speed driving is set. CONSTITUTION:The above-mentioned device controls opening degree of a throttle valve by driving an actuator 13 according to deviation gained after comparison by a comparator 15 between a fixed speed (Vo) memorized in a non-volatile memory 14 by putting a set switch 5 on ON, and car speed (V) detected by a car speed sensor 8. In this case, a one shot multi-vibrator 16 is installed as a means to fix operation time during which its output pulse range fluctuates, responding to the inclination theta detected by an inclination detection sensor 11 when the set switch 5 is on. And its output (P2) and an output (P1) of the comparator 15 are input into an OR gate 17 to elongate the initial operation time of (t) of the actuator 13's driving pulse (P3) as the detected inclination theta becomes bigger.
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