An accelerator pedal device, comprising: a pedal arm working in conjunction with an accelerator pedal; a housing for swingably supporting the pedal arm around a prescribed pivot axis line between a rest position and a maximum applied position; a hysteresis generation mechanism that comes in contact with the vicinity of an upper end of the pedal arm to generate hysteresis in a pedal force of the accelerator pedal; and an active control mechanism for performing control to push back the pedal arm toward the rest position under prescribed conditions between the pivot axis line and the hysteresis generation mechanism, wherein the active control mechanism includes a drive source provided in the housing, and the active control mechanism further includes a return lever that is rotatably driven with the drive source in the same direction as the direction of the swinging of the pedal arm, wherein the return lever is configured to apply a push back force to the upper end for pushing back the pedal arm toward the rest position by resisting the pedal force and the return lever is detachably engaged with the vicinity of the upper end of the pedal arm and applies the push back force to the pedal arm directly, characterized in that the hysteresis generation mechanism comprises a first slider, a second slider and a return spring, wherein the return spring is configured to exert a wedge action of pressing the inclined surface of the second slider against the inclined surface of the first slider, wherein the return spring is configured to press the first slider and the second slider toward a lower side inner wall surface and an upper side inner wall surface (11c") of the housing, and wherein the upper end of the pedal arm is formed with an engagement part which is detachably engaged with the first slider, a receptive groove for detachably receiving the apical part of the return lever, and a contact part capable of coming in contact with a rest stopper of the housing. a pedal arm working in conjunction with an accelerator pedal; a housing for swingably supporting the pedal arm around a prescribed pivot axis line between a rest position and a maximum applied position; a hysteresis generation mechanism that comes in contact with the vicinity of an upper end of the pedal arm to generate hysteresis in a pedal force of the accelerator pedal; and an active control mechanism for performing control to push back the pedal arm toward the rest position under prescribed conditions between the pivot axis line and the hysteresis generation mechanism, wherein the active control mechanism includes a drive source provided in the housing, and the active control mechanism further includes a return lever that is rotatably driven with the drive source in the same direction as the direction of the swinging of the pedal arm, wherein the return lever is configured to apply a push back force to the upper end for pushing back the pedal arm toward the rest position by resisting the pedal force and the return lever is detachably engaged with the vicinity of the upper end of the pedal arm and applies the push back force to the pedal arm directly, characterized in that the hysteresis generation mechanism comprises a first slider, a second slider and a return spring, wherein the return spring is configured to exert a wedge action of pressing the inclined surface of the second slider against the inclined surface of the first slider, wherein the return spring is configured to press the first slider and the second slider toward a lower side inner wall surface and an upper side inner wall surface (11c") of the housing, and wherein the upper end of the pedal arm is formed with an engagement part which is detachably engaged with the first slider, a receptive groove for detachably receiving the apical part of the return lever, and a contact part capable of coming in contact with a rest stopper of the housing.