A liquid crystal display device, includes: a liquid crystal display panel having a first substrate and a second substrate with a display area and a non-display area; a backlight that irradiates the liquid crystal display panel with light; an adhesive layer that adheres the liquid crystal display panel to the backlight; a first polarizing plate stuck onto the first substrate; and a second polarizing plate stuck onto the second substrate, in which an outer edge of the second polarizing plate is located outside an outer edge of the second substrate, a light impermeable film and an alignment mark part are formed in the non-display area of the first substrate, and the light impermeable film and the alignment mark part are different in infrared transmittance or infrared reflectance.