Light-emitting device and projector

A light-emitting device comprising:

• a first layer that generates light by an injection current and form a waveguide of the light;
• second and third layers that hold the first layer therebetween and suppress a leak of the light;
• and
• an electrode that injects the injection current into the first layer, wherein
• the waveguide of the light obtained by the injection current includes a belt-like first region, a belt-like second region and a belt-like third region,
• the first region includes a first portion having a curvature,
• the second region includes a second portion having a curvature,
• the first and second regions are connected in a reflecting section on a reflection surface provided on a side surface of the first layer,
• the third region forms a resonator,
• a distance between the third region and at least one of the first and second regions is a distance at which evanescent coupling occurs,
• first light is emitted from a first light emitting area of the first region on an emission surface provided on a side surface of the first layer opposed to the reflection surface,
• second light is emitted from a second light emitting area of the second region on the emission surface, and
• the first light and the second light are emitted in the same direction.