A vehicular pedal supporting structure includes a pedal bracket, a pedal, and a guide. A front portion of the pedal bracket is fixed to a first vehicle-body-side constituent member, while a rear portion of the pedal bracket is extended toward a rear of the vehicle. The pedal is supported on lateral side portions of the pedal bracket so as to be swingable around a center shaft. The guide causes the rear portion of the pedal bracket to be displaced backwards and downwards when the pedal bracket is displaced backwards as a result of application of a frontal external force to create a rotational displacement of the rear portion of the pedal bracket relative to the front portion. The pedal bracket is provided with a rupture creation mechanism for ensuring that the rear portion of the pedal bracket is at least partially ruptured from the front portion thereof when the rear portion is rotationally displaced.