BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A backlight unit includes alight guide plate, an inner frame that surrounds an outer periphery of the light guide plate, and an outer frame that surrounds an outer periphery of the inner frame. An inner periphery of the inner frame is formed with an inner protrusion that projects toward the outer periphery of the light guide plate. The outer periphery of the inner frame is formed with an outer protrusion that projects toward an inner periphery of the outer frame. The inner protrusion and the outer protrusion are located on opposite sides of a wall part that is one side part of the inner frame, and arranged at a distance from each other in a longitudinal direction of the wall part of the inner frame. According to the backlight unit, relative positional displacement of members can be suppressed while ensuring the ease of assembling.