A blind spot lens for a vehicle is provided. The blind spot lens comprises: a plane of incidence on which the ray of light from an object is received; a plane of emission, from which the ray of light exits through, inducing the exiting light to be projected on the side view mirror of a vehicle thus exhibiting the image of the object; a coupling plane to be contacted with the side view mirror when the blind spot lens is fixed thereon; and an inner angle between the plane of incidence and the plane of emission to be determined in accordance with the refractive index of the lens. The blind spot lens of the present invention, with a simple structure that is fixed to the side view mirror, makes it possible for the driver to see clearly on the side view mirror the presence of vehicles in the blind spots, and further, since the said lens projects only the objects in the blind spot, the driver can judge the situation in the blind point at a glance, This will make driving safe and easy, particularly in fast moving traffic situations where quick decisions are required for making lane-changes or similar maneuvers.