A vehicular illumination mechanism is mountable on a vehicle having a loading and unloading mechanism for moving a wheelchair between the vehicle and a road surface. The loading and unloading mechanism has an upper face portion and is movable between a stored position and an extended position. The vehicular illumination mechanism includes a position detection portion that is configured to detect a position of the loading and unloading mechanism, an illuminating lamp that is configured to illuminate the upper face portion of the loading and unloading mechanism extended to the extended position, and an illumination control portion that is configured to light the illuminating lamp when the position detection portion detects that the loading and unloading mechanism is in the extended position.
