Light source device with light splitting mirror and reflection mirror for reducing influence on uniformity of intensity distribution of beam flux, and projection device

A light source device comprising:

• a plurality of first solid-state light emitting elements configured to emit first beams;
• a light splitting mirror provided in correspondence to the first solid-state light emitting elements and configured to split the first beams, which are incident from a first direction, by penetration and reflection;
• a reflection mirror provided in correspondence to the light splitting mirror and configured to reflect one first beams split at the light splitting mirror in the same direction as the other first beams split at the light splitting mirror;
• and
• a plurality of second solid-state light emitting elements configured to emit second beams,
• wherein the light splitting mirror is provided in correspondence to a combination of the first solid-state light emitting elements and the second solid-state light emitting elements, and is configured to split the second beams, which are incident from a second direction different from the first direction, by penetration and reflection, and
• wherein the reflection mirror is provided in correspondence to the light splitting mirror and is configured to reflect one second beams split at the light splitting mirror in the same direction as the other second beams split at the light splitting mirror.