To provide a door side mirror as a rear wheel dead-angle confirming mirror capable of safely and speedily moving an automobile, allowing driver's eyes to confirm a dead angle of the side of a car using the door mirror.

In the door side mirror as the rear wheel dead-angle confirming mirror, a convex mirror B 11 is provided adjacent to a convex mirror A 1, a door mirror cover 12 is provided so as to cover the convex mirror A 1 and the convex mirror B 11, and a door mirror fixing stay 10 is provided fixed to a door.