A three-dimensional display device of a parallax barrier system including a liquid crystal display device of an IPS system having a TFT substrate and an opposed substrate as well as a liquid crystal barrier panel of a TN system having a first substrate and a second substrate, in which the opposed substrate of the liquid crystal display device and the second substrate of the liquid crystal barrier panel are opposedly arranged by interposing a polarizer, the TFT substrate includes a pixel configured by a common electrode having a slit above a pixel electrode configured in a planar shape, and includes a first pixel in which an angle made by an alignment axis of the TFT substrate and a direction of a long axis of the slit is θ1 and a second pixel in which an angle made by the alignment axis of the TFT substrate and the direction of the long axis of the slit is θ2, θ1 and θ2 are in a relationship θ1=−θ2, the first pixel and the second pixel are arranged to switch in a first direction, and arranged to switch in a second direction, and the alignment axis of the TFT substrate and an alignment axis of the second substrate of the liquid crystal barrier panel coincide with each other or are orthogonal to each other.