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1. A lighting device comprising: light sources arranged in an arrangement direction; a first light guide plate guiding light rays emitted by the light sources, the first light guide plate including: a first light entering surface opposed to the light sources, a first light exit surface that is on an opposite side from the first light entering surface, the first light exit surface including a first section that extends along the arrangement direction and covers the light sources, and a first light diffusion portion included in the first section and configured to refract light rays travelling from the light sources toward the first section travel in a crossing direction crossing the arrangement direction; and a second light guide plate disposed on the first light guide plate and guiding light rays that exit through the first light exit surface, the second light guide plate including: a second light entering surface opposed to the first light guide plate, a second light exit surface that is on an opposite side from the second light entering surface, the second light exit surface including a second section that extends along the arrangement direction and covers the first section, and a second light diffusion portion included in the second section and configured to refract light rays travelling from the second light entering surface toward the second section along a normal direction of the second light exit surface travel in the arrangement direction seen from the normal direction of the second light exit surface, the second light diffusion portion including first lenses that include ridgelines extending in the crossing direction and inclined portions inclined at an angle from 35° to 55° inclusive with respect to the normal direction; wherein the second light exit surface includes a third section that is different from the second section and does not overlap the light source, the second light guide plate further includes: second lenses that are in the third section, the second lenses having ridgelines that extend in the crossing direction and a cross-sectional shape taken along the arrangement direction that is the same as a cross-sectional shape of the first lenses, and third lenses that are in the third section, the third lenses having a recessed shape that extends along the arrangement direction, the third lenses being away from each other in the crossing direction, and the second lenses are arranged in the arrangement direction between the third lenses that are adjacent to each other.
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