| 摘要 |
An optical member 16 capable of light transmission and having a sheet-shape is installed in a chassis 13 of a backlight device 10 around an opening of the chassis 13. A cold cathode tube 15 capable of emitting light and having a substantially circle cross-section is installed behind the optical member 16 inside the chassis 13. A reflecting sheet 14 that reflects light emitted from the cold cathode tube 15 is installed behind the cold cathode tube 15 inside the chassis 13. The reflecting sheet 14 has a concave portion that surrounds the cold cathode tube 15 from the rear. The reflecting sheet 14 has an arch surface 26 at least in an area that faces the cold cathode tube 15 in a direction perpendicular to the surface of the optical member 16. The arch surface 26 is formed in a concentric manner as the cold cathode tube 15.
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