Patent ID: 8384845

Claim:
A liquid crystal display device comprising: a light guide plate which includes a front surface, a back surface and a side surface which connects a periphery of the front surface and a periphery of the back surface to each other; a casing which is arranged to face the side surface in an opposed manner with a distance away from the side surface of the light guide plate; a light source unit which is arranged between the side surface of the light guide plate and the casing or between the side surface of the light guide plate and a wall surface which is connected to the casing, the light source unit being arranged with a distance away from the casing or the wall surface which is connected to the casing, the light source unit allowing light to be incident on the side surface of the light guide plate; and a liquid crystal panel which is arranged on the front surface of the light guide plate, wherein the light source unit includes a plurality of light sources and a light source substrate to which the light sources are fixed, the light source unit is fixed to the light guide plate in a state where a predetermined distance from the side surface of the light guide plate is held, the side surface of the light guide plate includes a first side surface which faces the light source unit in an opposed manner, and a second side surface which is directed in the second direction orthogonal to the first direction which is the direction along which the light source unit and the first side surface face each other in an opposed manner, an engaging portion which is engageable with the casing is formed on the second side surface or an edge portion which forms the second side surface, and the engaging portion is configured to allow a change of a distance between the first side surface and the casing due to expansion or shrinkage of the light guide plate while restricting the movement of the light guide plate in the first direction.