Abstract: An electric rearview mirror system for a motor vehicle, in which drive mechanism, which have a function of turning the mirrors of the mirror units of said system and a function of moving the case of said units back and forth between a use position and a put-away position, are provided in said cases housing said mirrors, so that said mechanisms are operated in prescribed manners by a plurality of kinds of command signals supplied from manipulation means provided in the body of said vehicle, characterized by comprising a transmission means provided in the body of said vehicle to convert said command signals into serial signals and transmit said serial signals to said mirror units through electric wires; and control means provided in said cases to operate said drive mechanisms in said prescribed manners on the basis of said serial signals received by said control means from said wires.