TOWING MIRROR ASSEMBLY

A towing mirror assembly is for mounting to an exterior rear-view mirror. The towing mirror assembly includes a positioning seat, an auxiliary mirror piece, and an engaging unit. The positioning seat is for mounting over the exterior rear-view mirror, and has a hook set for engaging removably a main mirror frame of the exterior rear-view mirror, and a receiving groove unit having an engaging groove and a connecting subunit. The auxiliary mirror piece is mounted on the positioning seat. The engaging unit has an insertion member engaging removably the engaging groove, a cover plate for engaging removably the frame rim portion of the exterior rear-view mirror, and an engaging subunit matchingly engaged with the connecting subunit.