Light-source device and image projection apparatus

A light-source device comprising:

• an excitation light source configured to emit first color light;
• a wavelength conversion unit including a wavelength converting member configured to receive the first color light, convert at least some of the first color light into second color light having a wavelength different from a wavelength of the first color light, and emit the second color light;
• a light mixing element including a rod integrator configured to mix at least one of the first color light and the second color light emitted from the wavelength conversion unit;
• and
• an optical element disposed on an optical path of the first color light and having a reflecting surface configured to reflect the first color light,
• wherein a center of the first color light on the reflecting surface of the optical element intersects with only one of a first light flux of the first color light incident on the wavelength conversion unit and a second light flux of the first color light emitted from the wavelength conversion unit, and
• wherein an angle formed by a projection straight line of the first color light incident on an incident aperture of the rod integrator and a predetermined axial line of the incident aperture of the rod integrator is smaller than 40°.