A semiconductor light emitting device includes a mold resin having a cup shape portion on an upper surface of the mold resin. One or more holes penetrate through the cup shape portion to outside of the mold resin and/or one or more trenches extend from the cup-shaped portion to outside the mold resin. A first lead is provided in the mold resin and extending from the cup shape portion to outside of the mold resin in a first direction, and a second lead provided in the mold resin and extending from the cup shape portion to outside of the mold resin in a second direction which is opposite to the first direction. A light emitting element is mounted on the first lead in the cup shape portion, and a wire electrically connects the light emitting element and the second lead. A sealing resin is embedded in the one or more holes and the one or more trenches and is configured to seal the light emitting element and the wire.