A light emitting unit (1, 40) comprising plural kinds of light emitting elements (10, 40) with different light emitting wavelengths, wherein, among the plural kinds of light emitting elements, at least one kind of light emitting element includes: a semiconductor layer configured by laminating a first conductivity-type layer (11, 41), an active layer (12, 42) and a second conductivity-type layer (13, 43) and having a side surface exposing the first conductivity-type layer, the active layer and the second conductivity-type layer; a first electrode (14, 44) electrically connected to the first conductivity-type layer; a second electrode (15, 45) electrically connected to the second conductivity-type layer; a first insulation layer (16, 46) contacting at least an exposed surface of the active layer in the side surface of the semiconductor layer; and a metal layer (17, 47) contacting at least a surface of the first insulation layer (16, 46), which is opposite to the exposed surface of the active layer (12, 42), and electrically separated from the first electrode (14, 44); and the second electrode (15, 45); wherein the first electrode (14, 44); is a metal electrode present at a surface of the first conductivity-type layer (11, 41) and formed to contact a surface of a side of said first conductivity-type layer (11, 41) opposite to the active layer (12, 42); wherein the first insulation layer (16, 46) and the metal layer (17, 47) are formed from a region opposite to the side surface of the semiconductor layer to a region opposite to the first electrode (14, 44); and wherein a part of the metal layer overlaps a part of a surface of the first electrode (14, 44); opposite to a surface contacting the first conductivity-type layer (11,41), with the first insulation layer (16, 46) being interposed therebetween; wherein a part of the surface of a portion formed in a region of the first insulation layer (16, 46) which is opposite to the first electrode (14, 44), becomes an exposed surface not covered by the metal layer (17, 47), and wherein, among the plural kinds of light emitting elements, the light emitting element including the first insulation layer and the metal layer (17, 47) has a second insulation layer (18, 48) formed from the exposed surface over the surface of the metal layer (17, 47). a semiconductor layer configured by laminating a first conductivity-type layer (11, 41), an active layer (12, 42) and a second conductivity-type layer (13, 43) and having a side surface exposing the first conductivity-type layer, the active layer and the second conductivity-type layer; a first electrode (14, 44) electrically connected to the first conductivity-type layer; a second electrode (15, 45) electrically connected to the second conductivity-type layer; a first insulation layer (16, 46) contacting at least an exposed surface of the active layer in the side surface of the semiconductor layer; and a metal layer (17, 47) contacting at least a surface of the first insulation layer (16, 46), which is opposite to the exposed surface of the active layer (12, 42), and electrically separated from the first electrode (14, 44); and the second electrode (15, 45); wherein the first electrode (14, 44); is a metal electrode present at a surface of the first conductivity-type layer (11, 41) and formed to contact a surface of a side of said first conductivity-type layer (11, 41) opposite to the active layer (12, 42); wherein the first insulation layer (16, 46) and the metal layer (17, 47) are formed from a region opposite to the side surface of the semiconductor layer to a region opposite to the first electrode (14, 44); and wherein a part of the metal layer overlaps a part of a surface of the first electrode (14, 44); opposite to a surface contacting the first conductivity-type layer (11,41), with the first insulation layer (16, 46) being interposed therebetween; wherein a part of the surface of a portion formed in a region of the first insulation layer (16, 46) which is opposite to the first electrode (14, 44), becomes an exposed surface not covered by the metal layer (17, 47), and wherein, among the plural kinds of light emitting elements, the light emitting element including the first insulation layer and the metal layer (17, 47) has a second insulation layer (18, 48) formed from the exposed surface over the surface of the metal layer (17, 47).