Integral index management for a relational database is provided. The light emitting device also includes at least one of an electrically conductive wire electrically connecting the conductor wiring and the light emitting element, an exposed region of the substrate on which the conductor wiring is not disposed, and a protective element mounted on the conductor wiring. The occupant’s pelvis portion and a portion lower than the pelvis portion is moved forward but a part of his or her back above his or her breast is not varied. The glass substrate includes alkali oxide.