| 摘要 |
Provided is a backlight device which can suppress deterioration of uniformity. The backlight device (10) is provided with an LED (11), and a light guide plate (12) which includes a light incoming surface (12a) and a light outgoing surface (12b). An inclined surface (12c) which is inclined from the light outgoing surface is formed between the light incoming surface and the light outgoing surface of the light guide plate, and the light guide plate is formed such that the thickness of a portion on the light incoming surface side is more than that of a portion on the light outgoing surface side. At the front of the portion on the light incoming surface side of the light outgoing surface of the light guide plate, a regulating member (13), which has a light blocking characteristic and regulates shift of the light guide plate in the thickness direction of the light guide plate, is arranged.
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