PROBLEM TO BE SOLVED: To provide a light source device for condensing diffused light and parallel light into a light incident end surface of a predetermined light guide member, the light source device having a reduced whole size without deteriorating transmission efficiency of special light.SOLUTION: The light source device includes: a diffused light source for emitting diffused light a parallel light source portion for emitting parallel light and a condensing lens for condensing the diffused light and the parallel light into the light incident end surface of the predetermined light guide member. The diffused light source and the parallel light source portion are disposed on an axis parallel to the optical axis of the condensing lens.
