Light-emitting device

A light-emitting device comprising:

• a base member having an upper surface and a first wiring region arranged on the upper surface;
• a first light-emitting element disposed on the upper surface of the base member and having a first emission end surface configured to emit light;
• a photodetector disposed on the upper surface of the base member and having a light receiving surface configured to receive at least a part of the light emitted from the first emission end surface, the photodetector having a second wiring region;
• and
• one or a plurality of wiring lines, which includes a first wiring line that electrically connects between the first wiring region and the second wiring region, wherein
• the photodetector is positioned so that an imaginary line perpendicular to the first emission end surface through a first point and an imaginary line perpendicular to the first emission end surface through a second point pass through the photodetector, the first point and the second point being two points at which an imaginary line parallel to the first emission end surface through an inside of an outer edge of the first light-emitting element intersects the outer edge of the first light-emitting element in a top view,
• at least a part of the first wiring region is arranged in a first region between an imaginary line perpendicular to the first emission end surface through a third point and an imaginary line perpendicular to the first emission end surface through a fourth point, the third point and the fourth point being two points at which an imaginary line parallel to the first emission end surface through an inside of an outer edge of the photodetector intersects the outer edge of the photodetector in the top view,
• the first region is a region between imaginary lines parallel to the first emission end surface respectively through two points at which an imaginary line perpendicular to the first emission end surface through the inside of the outer edge of the first light-emitting element intersects the outer edge of the first light-emitting element in the top view, and
• the first wiring region to which the first wiring line is bonded is arranged in the first region.