An optical element covering member, a backlight and a liquid crystal display device

A sagging, unevenness, wrinkle, while suppressing the occurrence of warpage, white spot optical element covering member that deterioration of image quality can be suppressed, such as, as well as a backlight and a liquid crystal display device including the same. An optical element covering member has one or a more of optical elements, one or more of a support for supporting the optical element, at least one optical element and enveloping the support shrinkable covering member provided with a door. Of the sides forming the main surface of the support, opposite a pair of sides, inclusive are closed by member, the thickness of the support t, the length of the side of the support that has been closed by the covering member L, the tension F of the covering member which acts in a direction parallel to the sides of the length L satisfy the relationship of .FIELD 1