A tip portion of a half body has a joining plane section formed, whose tip of a flat plate part formed extending towards a right side in the width direction is bent at right angles towards the rear side. Similarly, a tip portion of a half body has a joining plane section formed, whose tip part of a flat plate part formed extending towards a left side in the width direction is bent at right angles towards the rear side. A stopper section for retaining the operation pedal in an initial position is fixed in a state sandwiched between the joining plane sections and that are provided projecting outside a space formed by joining the half bodies. As a result, an operation pedal device for vehicles whose assembling process is easy and which can secure a supporting rigidity with respect to a pivot movement of an operation pedal is provided.
