A vertical cavity surface emitting laser device includes a first
reflective mirror layer, a second reflective mirror layer, and an active
layer disposed therebetween, wherein at least one of the first reflective
mirror layer and the second reflective mirror layer includes a
periodic-refractive-index structure in which the refractive index
periodically changes in the in-plane direction and a part of the
periodic-refractive-index structure includes a plurality of parts that
disorder the periodicity.