An operating pedal supporting device in an automobile includes a first bracket fixedly provided at a rear face of a dashboard for supporting an operating apparatus at a front face, a second bracket fixedly provided at a strength member of a body of the automobile, a shear pin which usually connects first and second brackets to each other, but are broken when the first bracket receives excessive rearward load from a side of the dashboard, and allows rearward displacement of the first bracket, and a control lever supported at the first and second brackets via first and second pivots and supporting an operating pedal via a third pivot, and a middle portion of the operating pedal is connected to the operating apparatus. At a time of the rearward displacement of the first bracket, the operating pedal rotates so as to move a tread portion forward following swing of the control lever. Thus, kick back of the operating pedal is prevented even when the operating apparatus and the dashboard are displaced rearward by excessive load from front during operation of the operating pedal.