NOVELTY - A light-emitting unit comprises first light-emitting element (11) over an insulating surface, second light-emitting element (12) over insulating surface, first and second insulating layers are formed from the same layer, and separation layer (139) comprises a leg portion and a stage portion over the leg portion; a projected area of the stage portion to third electrode is larger than that of leg portion; one edge portion of second insulating layer is covered with second light-emitting layer, and the other edge portion of second insulating layer is in contact with separation layer.    USE - As light-emitting unit used in light-emitting device (claimed); used in e.g. battery as power source for portable use.    ADVANTAGE - Since a metal mask is not used in the manufacturing method, problems caused by damage of a surface of the substrate due to an edge of an opening in the metal mask can be prevented; thus, the light-emitting unit with high reliability can be provided. Moreover, since a metal mask is not used, thus reduces a manufacturing cost and maintenance cost such as cleaning. The light-emitting unit provides small energy loss.    DETAILED DESCRIPTION - A light-emitting unit comprises first light-emitting element (11) over an insulating surface, second light-emitting element (12) over insulating surface, separation layer (139), first insulating layer, and second insulating layer, where first light-emitting element comprising first electrode, second electrode overlapping with the first electrode; and a first light-emitting layer comprising an organic compound between first electrode and the second electrode. The second light-emitting element comprising a third electrode, a fourth electrode overlapping with the third electrode, and second light-emitting layer comprising an organic compound between third electrode and fourth electrode, where the first insulating layer covers an edge portion of first electrode, where the second insulating layer is formed over third electrode; the first electrode and the third electrode are island-shaped, where the first electrode and the third electrode are formed from the same layer that is capable of transmitting light emitted by the first light-emitting layer, where the first insulating layer and the second insulating layer are formed from the same layer, where the second electrode and the fourth electrode are formed from the same layer, where the separation layer is formed over the third electrode. The separation layer comprises a leg portion and a stage portion over the leg portion; a projected area of the stage portion to the third electrode is larger than that of the leg portion; one edge portion of the second insulating layer is covered with the second light-emitting layer, and the other edge portion of the second insulating layer is in contact with the separation layer. The second electrode is configured to extend beyond the edge portion of first electrode with first insulating layer interposed between it; and the second electrode is electrically connected to third electrode in a region overlapping with the stage portion. INDEPENDENT CLAIMS are included for the following:    (1) light-emitting device comprising a converter, where the light-emitting unit is driven by an output voltage of the converter; and    (2) manufacturing a light-emitting unit, involving forming a first electrode and a third electrode, which are to be lower electrodes, over an insulating surface; forming a first insulating layer covering an edge portion of the first electrode, and a second insulating layer over the third electrode; forming a first photosensitive resin over the third electrode, and a second photosensitive resin having sensitivity different from that of the first photosensitive resin over the first photosensitive resin, selectively exposing the first photosensitive resin and the second photosensitive resin, developing the first photosensitive resin and the second photosensitive resin to form a leg portion, which is in contact with the third electrode and the second insulating layer, from the first photosensitive resin, and to form a stage portion, which protrudes beyond the leg portion over the third electrode, from the second photosensitive resin, thereby forming a separation layer comprising the leg portion and the stage portion, forming a light-emitting layer comprising an organic compound in a region overlapping with the stage portion of the third electrode by suppressing entrance of the light-emitting layer, and forming a conductive film, which is to be an upper electrode comprising a second electrode, in the region overlapping with the stage portion of the third electrode by promoting entrance of the conductive film so that the second electrode is in contact with the third electrode, where the first electrode and the third electrode are formed to be island-shaped.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of light-emitting unit.    First light-emitting element (11)    Second light-emitting element (12)    Third light-emitting element (13)    Substrate (100)    Electroluminescence layer (102a-102c)    Partition wall (107)    Wiring (133a, 133b)    Planarization layer (134)    Sealing film (138a, 138b)    Separation layer (139)    Extraction electrode (160)