A light-emitting device comprising: a first electrode; a second electrode that forms a pair with said first electrode; and an organic semiconductor layer comprising a photoelectric converting layer that emits light by recombining holes removed from one of said first electrode and said second electrode with electrons removed from the other of said first electrode and said second electrode; wherein said organic semiconductor layer comprises: between said first electrode and said photoelectric converting layer a light extraction improving layer that partially reflects light, and has transparency; a hole injection layer (47; 47, 47a; 47c) that is formed on one of said first electrode and said second electrode and facilitates the removal of holes from said one electrode (46; 52); a hole transporting layer (48; 48a) that transports holes removed by said hole injection layer (47; 47, 47a; 47c) to said photoelectric converting layer; an electron injection layer that facilitates the removal of electrons from the other of said first electrode and said second electrode; and an electron transporting layer that transports electrons removed by said electron injection layer to said photoelectric converting layer, wherein said first electrode is transparent or semitransparent, said second electrode reflects light, said light extraction improving layer is formed within the organic semiconductor layer such that it is not adjacent to the first electrode, and further comprises a discontinuous portion, characterised in that said light extraction improving layer is formed between said hole injection layer (47; 47, 47a; 47c) and said hole transporting layer (48; 48a). a first electrode; a second electrode that forms a pair with said first electrode; and an organic semiconductor layer comprising a photoelectric converting layer that emits light by recombining holes removed from one of said first electrode and said second electrode with electrons removed from the other of said first electrode and said second electrode; wherein said organic semiconductor layer comprises: between said first electrode and said photoelectric converting layer a light extraction improving layer that partially reflects light, and has transparency; a hole injection layer (47; 47, 47a; 47c) that is formed on one of said first electrode and said second electrode and facilitates the removal of holes from said one electrode (46; 52); a hole transporting layer (48; 48a) that transports holes removed by said hole injection layer (47; 47, 47a; 47c) to said photoelectric converting layer; an electron injection layer that facilitates the removal of electrons from the other of said first electrode and said second electrode; and an electron transporting layer that transports electrons removed by said electron injection layer to said photoelectric converting layer, between said first electrode and said photoelectric converting layer a light extraction improving layer that partially reflects light, and has transparency; a hole injection layer (47; 47, 47a; 47c) that is formed on one of said first electrode and said second electrode and facilitates the removal of holes from said one electrode (46; 52); a hole transporting layer (48; 48a) that transports holes removed by said hole injection layer (47; 47, 47a; 47c) to said photoelectric converting layer; an electron injection layer that facilitates the removal of electrons from the other of said first electrode and said second electrode; and an electron transporting layer that transports electrons removed by said electron injection layer to said photoelectric converting layer, wherein said first electrode is transparent or semitransparent, said second electrode reflects light, said light extraction improving layer is formed within the organic semiconductor layer such that it is not adjacent to the first electrode, and further comprises a discontinuous portion, characterised in that said light extraction improving layer is formed between said hole injection layer (47; 47, 47a; 47c) and said hole transporting layer (48; 48a).