To provide a video display device which can get along with multiple kinds of reflective display devices having different angles at which minute mirrors are driven, without having adversely affecting display video.

A circuit board 33 can be installed in a regularly directed state and in a reversely directed state, which are different for two kinds of DMDs having different driving angles. A position of a light detecting element 15 in the regularly directed state and a position of the light detecting element 15 in the reversely directed state bear relation of point symmetry with respect to a reference point SP being a central point of a reference line connecting screw holes 35, 36, and are located apart from the reference point SP by distance L. In addition, an optical axis center line of off-light 17a and an optical axis center line of off-light 17b have relation where a median line ML of them passes through the reference point SP.