The presented invention relates to a light deflector. The light deflector defining a light-incident side and a light-exiting side, the deflector comprising a plurality of reflector(42) arranged side-by-side in a predetermined orientation, each reflector having, a first reflection face(42A), provided on the deflector light-incident side, for reflecting incident light so as to focus the light, and a second reflection face (42B), provided on the deflector light-exiting side, for reflecting light reflected by the first reflection face of an adjacent reflection means(42). In accordance with the present invention, light utilization efficiency can be raised.