Light source device and projector

A light source device comprising:

• a light source section;
• a diffusing device on which a portion of light emitted from the light source section is incident, the diffusing device diffusely emitting the portion of the light;
• a wavelength conversion device on which another portion of the light emitted from the light source section is incident, the wavelength conversion device diffusely emitting converted light at a wavelength different from that of the another portion of the light;
• a light combining device combining the portion of the light diffused by the diffusing device with the converted light emitted from the wavelength conversion device;
• and
• an auxiliary diffusing element located between the light source section and the diffusing device on an optical path of the portion of the light, the auxiliary diffusing element diffusing the portion of the light and causing the portion of the light to be incident on the diffusing device, wherein
• an optical path of the another portion of the light from the light source section to the wavelength conversion device is longer than the optical path of the portion of the light from the light source section to the diffusing device.