A pedal bracket (3) affixed to a dash panel (1) pivotably supports a pedal unit (2) via a first pivot shaft (13) and a pivotable lever (5) via a second pivot shaft (17). A shaft retainer (51) prevents a downward displacement of the first pivot shaft (17) under normal conditions, whereas the pivotable lever (5) goes into contact with a side member (33) of a vehicle body and pivots on the second pivot shaft (17) in a specific direction in the event of a vehicle collision, thereby thrusting and displacing the first pivot shaft (13) downward and disengaging the pedal unit (2) from the pedal bracket (3). At this time, the shaft retainer (51) draws back from underneath the first pivot shaft (13), for instance, as a result of pivoting of the pivotable lever (5) and goes into a nonrestrictive state in which the shaft retainer (51) allows a displacement of the first pivot shaft (13).