A tibia pad has: a right foot placement portion having a right side horizontal portion positioned beneath and rearward of an accelerator pedal on which a passenger's heel who is stepping-on the accelerator pedal is placed, and a right side inclined portion integrally formed with a vehicle front side of the right side horizontal portion and positioned beneath the accelerator pedal; and a rib formed at least at a bottom surface of the right side horizontal portion at the right foot placement portion by a region between a pair of groove portions that are formed so as to extend along a vehicle longitudinal direction and so as to be lined-up in a vehicle transverse direction, and that is provided at a position that is offset toward a vehicle transverse direction one side with respect to a central line that passes-through a vehicle transverse direction central portion of the accelerator pedal.