Abstract: A warning light for blind area of lane change is provided that includes a housing having an opening for providing a light exiting surface and a receiving cavity; a circuit board disposed in the receiving cavity of the housing, the circuit board has at least one light source disposed toward the light exiting surface such that the at least one light source emits light toward the light exiting surface; and at least one reflecting panel disposed between the light source and the light exiting surface for reflecting stray light in light emitted from the at least one light source to the light exiting surface. The warning light for blind area of lane change can remind the driver of the vehicle rear side by emitting an optical signal to improve driving safety, and has simple assembly, simple structure, ingenious design, and high light utilization rate.