A rear-view mirror assembly is formed of a base, a main mirror, and an auxiliary mirror. The main and auxiliary mirrors are mounted to the base. The base includes a positioning portion and at least one guiding portion located an external side of the positioning portion. The auxiliary mirror includes at least one guided portion and an assembly portion having a complementary shape with that of the positioning portion for making the auxiliary mirror be rotatably installed to the positioning portion. In light of this, the driver can easily adjust an inclined angle between the main and auxiliary mirrors to lead to the preferable field of vision of the main mirror to avoid the blind spots of the drive for more driving safety.