An in-plane switching mode liquid crystal display (LCD) device, which reduces loss in transmittance and improves reflectance, and a method for fabricating the same are disclosed. The in-plane switching mode LCD device includes gate and data lines orthogonally crossing each other on a first substrate to define pixel regions having reflection portions and transmission portions; thin film transistors formed at the crossing of the gate and data lines; common electrodes formed at the transmission portions of the pixel regions; reflection electrodes formed at the reflection portions of the pixel regions; pixel electrodes formed parallel with the common electrodes at the transmission portions and formed above the reflection electrodes at the reflection portions; a second substrate facing and attached to the first substrate; a liquid crystal layer interposed between the first and second substrates; and first and second polarizing films respectively attached to outer surfaces of the first and second substrates.