Alight emitting device comprising: a substrate including a base material (62, 82) having a rectangular planar shape, a connection terminal (63, 83) disposed on a first main surface of the base material (62, 82), and an outer connection portion disposed on a second main surface of the base material opposite to the first main surface, the connection terminal including a protruding portion (63a, 83a), and the connection terminal being connected to the outer connection portion via a through hole (62a, 82d) defined in the base material (62, 82); a light emitting element connected to the connection terminal on the first main surface of the base material via a molten bonding material; and a light reflecting member, the light reflecting member being placed in contact with and covering - a position of the molten material that is not in contact with the electrode of the light emitting element, - a position of the light emitting element facing the substrate and not being in contact with the molten material, and - the whole of side surfaces of the light emitting element, wherein an entire edge portion of the protruding portion (63a,83a) is separated from the edge portion of the connection terminal (43, 53) on the first main surface of the base of the substrate, and wherein the molten material covers the whole of the side surface of the protruding portion and the first main surface of the connection terminal on the peripheral side of the protruding portion. a substrate including a base material (62, 82) having a rectangular planar shape, a connection terminal (63, 83) disposed on a first main surface of the base material (62, 82), and an outer connection portion disposed on a second main surface of the base material opposite to the first main surface, the connection terminal including a protruding portion (63a, 83a), and the connection terminal being connected to the outer connection portion via a through hole (62a, 82d) defined in the base material (62, 82); a base material (62, 82) having a rectangular planar shape, a connection terminal (63, 83) disposed on a first main surface of the base material (62, 82), and an outer connection portion disposed on a second main surface of the base material opposite to the first main surface, the connection terminal including a protruding portion (63a, 83a), and the connection terminal being connected to the outer connection portion via a through hole (62a, 82d) defined in the base material (62, 82); a light emitting element connected to the connection terminal on the first main surface of the base material via a molten bonding material; and a light reflecting member, the light reflecting member being placed in contact with and covering - a position of the molten material that is not in contact with the electrode of the light emitting element, - a position of the light emitting element facing the substrate and not being in contact with the molten material, and - the whole of side surfaces of the light emitting element, - a position of the molten material that is not in contact with the electrode of the light emitting element, - a position of the light emitting element facing the substrate and not being in contact with the molten material, and - the whole of side surfaces of the light emitting element, wherein an entire edge portion of the protruding portion (63a,83a) is separated from the edge portion of the connection terminal (43, 53) on the first main surface of the base of the substrate, and wherein the molten material covers the whole of the side surface of the protruding portion and the first main surface of the connection terminal on the peripheral side of the protruding portion.