1. A light source device comprising:
a light source for emitting excitation light;
a first optical system for condensing excitation light emitted from the light source into a rectangular shape;
a fluorescent wheel having a plurality of light emitting portions emitting different color light in response to irradiation
of the excitation light formed in such a manner in which each of the multiple light emitting portions is irradiated with the
excitation light condensed in a rectangular shape by the first optical system;

a second optical system for condensing color light emitted from each of the multiple light emitting portions in response to
irradiation of the rectangularly condensed excitation light; and

a rotating prism that is rotatably arranged on the optical path of the light condensed by the second optical system and that
shifts the optical axis of the light condensed by the second optical system as the prism turns.