Light source apparatus and projector

A light source apparatus comprising:

• a first light source configured to output first light having a first wavelength band;
• a wavelength converter configured to convert the first light into second light having a second wavelength band different from the first wavelength band;
• a first optical layer disposed between the first light source and the wavelength converter and configured to transmit the first light and reflect the second light;
• a second light source configured to output third light having a third wavelength band different from the second wavelength band;
• a light guide disposed between the first optical layer and the wavelength converter and configured to guide the second light, into which the first light is converted by the wavelength converter, and the third light output from the second light source;
• a parallelizing system disposed between the second light source and the light guide and configured to parallelize the third light and cause the parallelized third light to enter the light guide;
• and
• a second optical layer disposed between the parallelizing system and the light guide and configured to transmit the third light and reflect the second light,
• wherein the wavelength converter has a first surface and a second surface that face opposite sides, and a third surface that intersects with the first surface and the second surface,
• the first light output from the first light source is incident on the third surface of the wavelength converter via the first optical layer,
• the second light, into which the first light is converted by the wavelength converter, travels through the light guide, and exits out of a region on the first surface side of the light guide, and
• the third light output from the second light source is parallelized by the parallelizing system, enters a region on the second surface side of the light guide via the second optical layer, travels through the light guide in a direction parallel to the third surface, and exits out of the region of the light guide, which is a region facing the first surface.