There is disclosed a light deflector in which both ends of a movable plate
is supported to a support substrate by an elastic support portion, a
reflection surface is formed on one surface of the movable plate, and the
movable plate is torsion-oscillated about a torsion axis of the elastic
support portion as a center to deflect an incident light that enters the
reflection surface, wherein a recessed portion is formed on at least one
side surface of both sides, which is a surface on which the reflection
surface is not formed, and between which the torsion axis of the elastic
support portion is interposed.