A backlight structure includes a light guide plate, at least one light source module, and a reflective cover. The light guide plate has a light incident side and a light-exiting surface, wherein the light-exiting surface is formed at an edge of the light incident side. The light source module includes a substrate and at least one light emitting element, wherein the light emitting element disposed on the substrate emits light to the light incident side. The reflective cover has a first reflecting portion and a second reflecting portion, wherein the second reflecting portion extends from the first reflecting portion disposed between a surface of the substrate and the light incident side of the light guide plate and covers a part of the light-exiting surface, so that the reflective cover reflects light emitted from the light emitting element to the light guide plate.