Abstract: A rearview mirror apparatus for a motor vehicle, includes a mounting piece attachable to the motor vehicle; a prismatic body consisting of an intermediary part pivotally connectable to the mounting piece and a holder having an anterior opening; and a mirror element mounted in the anterior opening of the holder. The holder is symmetric relative to a longitudinal horizontal "X" axis thereof and has two bases projecting from one side thereof and the bases are positioned symmetrically on opposite sides of the "X" axis. The intermediary part has two corresponding projecting end pieces positioned to engage the two bases when the holder engages the intermediary part. The bases each have a mounting hole and one of the projecting end pieces has a threaded hole positioned so that, when the holder is engaged with the intermediary part, the holder can be secured to the intermediary part by a fixing screw engaged in the threaded hole and one of the holes of the bases.