The present invention provides a liquid crystal display device which mounts a back-surface conductive film on one substrate, wherein a reference potential is surely supplied to the back-surface conductive film. The liquid crystal display device includes a first substrate, a second substrate, and liquid crystal sandwiched between the first substrate and the second substrate, wherein the second substrate includes a back-surface conductive film on a surface thereof opposite to the liquid crystal, and the first substrate includes a pad electrode which is formed on the first substrate and is electrically connected with the back-surface conductive film via a conductive member, a conductive film which is formed on the first substrate and below the pad electrode, a first connection line which connects the conductive film and a reference voltage terminal, and at least one contact hole which connects the pad electrode and the conductive film. The conductive film of the first substrate is formed of a metal film or a transparent conductive film.