Light source device and projector

A light source device comprising:

• a wavelength conversion member including at least a phosphor, and configured to convert excitation light in an excitation wavelength band into first light in a first wavelength band different from the excitation wavelength band;
• a first light source section configured to emit the excitation light;
• a second light source section configured to emit second light in a second wavelength band different from the first wavelength band;
• and
• a color combining element configured to combine the first light and the second light with each other to form composite light and emit the composite light, wherein
• the wavelength conversion member has a first end surface and a second end surface opposed to each other, and a side surface crossing the first end surface and the second end surface,
• the excitation light enters the wavelength conversion member from the side surface, and the first light is emitted from the first end surface,
• the light combining element has a first surface and a second surface opposed to each other, and a third surface crossing the first surface and the second surface, and
• the first light emitted from the wavelength conversion member enters the color combining element from the first surface, the second light emitted from the second light source section enters the color combining element from the third surface, and the composite light is emitted from the second surface.