A light emitting device includes a substrate having a first main surface that serves as the light extraction surface, a second main surface that is opposite the first main surface, and a mounting surface that is adjacent to at least the second main surface, and that is provided an insulating base material, a pair of connection terminals disposed on the second main surface, and a heat dissipation terminal disposed on the second main surface and between the pair of connection terminals; a light emitting element that is mounted on the first main surface of the substrate and; a sealing member that seals the light emitting element and is formed substantially in the same plane as the substrate on the mounting surface.