An illumination device comprising: a light source including a plurality of light emitting devices that are arranged to generate and guide light and having tilted gain regions (161, 162) in which guiding directions of the light are tilted with respect to a perpendicular of output surfaces of the light; an optical axis conversion device that is arranged to bend optical axes of the light output from the light source; and a light distribution control device that is arranged to control a light distribution angle of the light output from the optical axis conversion device, wherein the light emitting devices are super luminescent diodes, characterized in that the light output from the light distribution control device is arranged to diverge, wherein the light emitting devices include a first tilted gain region in which the guiding direction of the light is tilted to one side with respect to the perpendicular of the output surface, and a second tilted gain region in which the guiding direction of the light is tilted to the other side with respect to the perpendicular of the output surface, wherein a reflection surface of the first gain region and a reflection surface of the second gain region overlap at least partially, or wherein the light source includes first light emitting devices having first tilted gain regions in which the guiding direction of the light is tilted to one side with respect to the perpendicular of the output surface, and second light emitting devices having second tilted gain regions in which the guiding direction of the light is tilted to the other side with respect to the perpendicular of the output surface, the first tilted gain regions and the second tilted gain regions being alternately arranged. a light source including a plurality of light emitting devices that are arranged to generate and guide light and having tilted gain regions (161, 162) in which guiding directions of the light are tilted with respect to a perpendicular of output surfaces of the light; an optical axis conversion device that is arranged to bend optical axes of the light output from the light source; and a light distribution control device that is arranged to control a light distribution angle of the light output from the optical axis conversion device, wherein the light emitting devices are super luminescent diodes, characterized in that the light output from the light distribution control device is arranged to diverge, wherein the light emitting devices include a first tilted gain region in which the guiding direction of the light is tilted to one side with respect to the perpendicular of the output surface, and a second tilted gain region in which the guiding direction of the light is tilted to the other side with respect to the perpendicular of the output surface, wherein a reflection surface of the first gain region and a reflection surface of the second gain region overlap at least partially, or wherein the light source includes first light emitting devices having first tilted gain regions in which the guiding direction of the light is tilted to one side with respect to the perpendicular of the output surface, and second light emitting devices having second tilted gain regions in which the guiding direction of the light is tilted to the other side with respect to the perpendicular of the output surface, the first tilted gain regions and the second tilted gain regions being alternately arranged.