A liquid crystal display panel including a first substrate and a second substrate is provided. The first substrate is provided at plural positions with a first scale pattern made of the same material as a scanning line, and extending in a row direction or a column direction, and a second scale pattern made of the same material as a signal line at plural positions, and extending in the row direction or the column direction. The second substrate is provided with a third scale pattern extending in the row direction and a fourth scale pattern extending in the column direction, respectively, at positions which are opposite to the first and second scale patterns.