In a case of a mistaken pedal operation determination: ON, the driving assist ECU sets a value of a steering angle threshold θref to a value θref2 which is greater than a normal value of the steering angle threshold, and sets a value of a steering operation rate threshold ωref to a value ωref2 which is greater than a normal value of the steering operation rate threshold. When a steering angle θ is equal to or greater than the steering angle threshold θref and/or when a steering operation rate ω is equal to or greater than the steering operation rate threshold ωref, the ECU delays a start timing of a automatic brake control, by setting a value of a threshold for executing TTCa to a delaying execution threshold TTCa2 that is smaller than a normal value of the threshold for executing TTCa.