Light emitting device

A light emitting device comprising:

• a package including a base member, a frame member having a plurality of inner lateral surfaces, and a cover;
• a light emitting element surrounded by the frame member and disposed on an upper surface of the base member, the light emitting element being configured to emit directional light traveling in a lateral direction;
• and
• a light receiving body surrounded by the frame member and disposed on the upper surface of the base member at a lateral side of the light emitting element to receive the light, wherein
• the cover has a lower surface, at least a part of the lower surface of the cover being located over the light receiving body and the light emitting element,
• when an optical axis direction of the directional light emitted from the light emitting element is a first direction, the plurality of inner lateral surfaces of the package include a first inner lateral surface and a second inner lateral surface facing each other in a second direction perpendicular to the first direction in a top view,
• the light emitting element is disposed in a first arrangement region located between the first inner lateral surface and the second inner lateral surface,
• in the second direction, a length of the light receiving body is longer than a distance between the first inner lateral surface and the second inner lateral surface,
• in a third direction perpendicular to the upper surface of the base member,
• a height of an upper surface of the light receiving body from the upper surface of the base member is higher than a height of an upper surface of the light emitting element from the upper surface of the base member,
• a height of a lower surface of the light receiving body from the upper surface of the base member is lower than a height of a lower surface of the light emitting element from the upper surface of the base member, and
• a length of the light receiving body is longer than a distance from the upper surface of the light emitting element to the lower surface of the cover,
• the light receiving body has a first lateral surface facing the light emitting element and a second lateral surface opposite to the first lateral surface, and
• the second lateral surface of the light receiving body faces a first opposing surface arranged adjacent to the second lateral surface with a space being formed between the second lateral surface and the first opposing surface.