PROBLEM TO BE SOLVED: To provide an accelerator pedal misstep prevention device capable of detecting and controlling an accelerator pedal depressing error in the entire speed range of a vehicle. An accelerator pedal misstep prevention device 10 of the present invention divides a vehicle speed region into a plurality of regions, and in each of the divided speed regions, an abnormal change in the accelerator signal is made based on the vehicle speed and the accelerator signal. It is characterized by including a signal switching control unit 20 that controls to limit the increase in engine output when it is detected or gives a warning when the set speed is exceeded. [Selection diagram] Fig. 1
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