Abstract: A metal-base substrate includes a metal plate, an adhesive layer; and a film substrate. The adhesive layer is interposed between the metal plate and the film substrate. The film substrate has a wiring layer on a first surface opposite to a second surface on which the adhesive layer is arranged, with a through hole piercing through the film substrate in a thickness direction of the film substrate.

Abstract: A light emitting device including a light emitting element, a light transmissive member, a light guide member, and a light reflective member. The light transmissive member is disposed on an upper surface of the light emitting element, and has a lower surface including a first region facing the light emitting element and a second region positioned outside of the first region. The light guide member covers a lateral surface of the light emitting element and the second region of the lower surface of the light transmissive member. The light reflective member covers the light emitting element, an upper surface of the light transmissive member and the light guide member. One of lateral surfaces of the light transmissive member is exposed from the light reflective member.