Disclosed is a support structure for a vehicle control pedal, which comprises a pedal bracket (3) supporting the control pedal (4) through a first support shaft (S1) inserted through a support hole (303), a swingable lever (7) adapted to, during a vehicle collision, come into interference with a vehicle body member (6) so as to be swingingly moved about a second support shaft (S2) while pushing the first support shaft (S1) downwardly to allow the first support shaft (S1) to drop out of the support hole (303), and a drop-out restriction member (8) engaged by a pin member (20) and coupled to the swingable lever (7) in a relatively unswingable manner, so as to restrict the drop-out of the first support shaft (S1). The support structure is designed such that, according to the swing movement of the swingable lever (7) during the vehicle collision, the restriction on drop-out of the first support shaft (S1) by the drop-out restriction member (8) is removed to allow the first support shaft (S1) to drop out of the support hole (303). The support structure of the present invention can prevent impact energy during a vehicle collision from being input to a leg of a driver through the control pedal while reliably restricting accidental drop-out of the control pedal in a normal condition.