Pedal assembly support structure for vehicle

A vehicle pedal assembly support structure comprises: a bracket ( 5 ) to which a pivot shaft ( 42 ) for a pedal lever ( 4 ) is mounted; a guide member ( 6 ) fixed to a vehicle body member ( 7 ) other than a dash panel ( 1 ); a fixing mechanism ( 60 ) for normally fixing a rear end portion of the bracket ( 5 ) to a front end portion of the guide member ( 6 ) but disengaging the bracket ( 5 ) from the guide member ( 6 ) in a vehicle collision; and a relative shift restricting member ( 66 ) for restraining the rear end portion of the bracket ( 5 ) from relatively shifting in directions other than the rearward direction of the vehicle to the front end portion of the guide member ( 6 ). The guide member ( 6 ) is provided with a guide surface ( 65 ) for downwardly guiding the bracket ( 5 ) moving backward in the vehicle collision to change the posture of the bracket ( 5 ).