Light source device and optical inspection system

A light source device adapted to provide an inspection beam is provided. The light source device includes a housing, a plurality of first light illuminating elements, and a plurality of light guiding structures. The housing has a light exiting port, and a first accommodating space. The plurality of first illuminating elements are disposed in the first accommodating space and are adapted to provide a plurality of first light beams. The plurality of light guiding structures are disposed in the first accommodating space, wherein the plurality of first illuminating elements respectively correspond to the plurality of light guiding structures, and the plurality of light guiding structures respectively guide the plurality of first light beams to be transmitted in different directions. The first light beams are transmitted out of the light exiting port to form the inspection light beam.