An operational pedal support structure of an automotive vehicle comprises a fixed pedal support member on the side of a dash panel, a swing pedal support member, a pedal body supported at the swing pedal support member via a first pivotal axis, a holding portion to allow a downward move of the first pivotal axis only in case the rotational lever rotates, and a pressing portion provided at the rotational lever so as to press down the swing pedal support member. The pressing portion is positioned in front of the second pivotal axis. Accordingly, the operational pedal support structure of an automotive vehicle equipped with a means mechanism for compulsively moving down the pedal at the vehicle frontal collision, which can be made compact and simple with a high reliability, can be provided.