A liquid crystal display unit having one pair of substrates, a liquid crystal layer held between the pair of substrates, a plurality of scanning lines formed on one of the pair of substrates, a plurality of data lines which cross the scanning lines in matrix form, thin film transistors formed near the crossing points of the scanning lines and data lines, and pixel electrodes connected to the thin film transistors. A source electrode and a drain electrode of each thin film transistor, and each data line, are made of a molybdenum alloy having a chromium content in a range of 1.5 weight % to 5 weight %.