To provide a rear view check which is attachably and detachably mounted at a normally used spectacle lens.

The rear view check mirror mountable at the spectacle lens is provided with a mounting surface 2 coming into tight contact with the spectacle lens surface on one surface of a main body 1 and is provided with a mirror finished surface 3 of a convex shape on the other surface. The spectacle lens coming into tight contact with the spectacle lens consists of a suction cup. The outer periphery of the mirror finished surface 3 is larger than the outer periphery of the mounting surface 2 and a clearance 6 to facilitate attachment and detachment is disposed between the mirror finished surface 3 and the mounting surface 2.