A vehicle side mirror apparatus for looking backward circumstances of a vehicle has: a housing that is of a transparent or semitransparent material with a cross section having a predetermined thickness, the housing having a light entering end into which light enters, and a light radiating end that faces the back of the vehicle; and an LED lamp that is disposed in the vicinity of the light entering end. Light emitted from the LED lamp enters into the light entering end of the housing, passing through within the cross section, being radiated to the back of the vehicle from the light radiating end of the housing.