To provide a pedal device of an automobile which can be made compact and surely operated in emergency with little failure, and which is equipped with a return bounce generating mechanism which can be used even as a detector for electrically detecting the angle of rotation of a pedal arm.

A pedal device 1 of an automobile is provided with a supporting frame 2, an acceleration pedal arm 3 supported by the supporting frame so as to be freely rotatable in an R direction with a shaft A as a center, a spring means 4 for energizing the rotation of the acceleration pedal arm 3 to an initial rotational position, and a return bounce generating mechanism 5 for applying a gradually increasing return bounce to the rotation in the R direction of the acceleration pedal arm 3.