To integrate an accelerator information input circuit into one kind and to automatically execute selection of its connection for connection work by corresponding the accelerator information input circuit of one kind to the two information input system of a pull-up terminal or a pull-down terminal.

The middle point potential of a potentiometer 1 where the middle point of an accelerator sensor 2 is displaced associatively with an accelerator pedal is inputted to an analog/digital(A/D) converter circuit 3, and a digital output after A/D conversion is inputted to a CPU 4. Also, for the analog input of the A/D converter circuit 3, a pull-up terminal 6 connected to a DC power source Vcc via a resistor R1 and a pull-down terminal 7 connected to a ground potential G via a resistor R2 are provided, and a control circuit 4 identifies an input terminal where a voltage V is 0A+<V<Vcc-α at the time of its starting, α and β being upper and lower limit margin voltages, and fetches accelerator sensor information from the input terminal of the identified side.