SEMICONDUCTOR LIGHT EMITTING DEVICE AND SEMICONDUCTOR LIGHT EMITTING UNIT

This semiconductor light emitting device comprises: a substrate that has a substrate front surface, a substrate back surface, and substrate lateral surfaces; front-surface-side wiring; back-surface-side wiring; and a semiconductor light emitting element that has a light emitting element lateral surface as a light emitting surface. The substrate lateral surfaces include a first substrate lateral surface which faces the same side as the light emitting element lateral surface that is a light emitting surface, and a second substrate lateral surface on the reverse side from the first substrate lateral surface. The semiconductor light emitting element is disposed so as to be offset more toward the first substrate lateral surface than the second substrate lateral surface. Provided to the first substrate lateral surface is an end surface through hole which passes through the substrate in the thickness direction of the substrate and which connects the front-surface-side wiring and the back-surface-side wiring.