PURPOSE: To discriminate whether or not even for the liquid crystal display device which has an additional capacitor for charge holding formed between a pixel electrode and a precedent-stage or succeeding-stage scanning signal conductor is normal before a driving circuit is mounted by enabling an all- illumination test of the liquid crystal display device.

CONSTITUTION: Plural scanning signal conductors and image signal conductors 2 are disposed in a matrix shape and pixel electrodes 3 are provided at the intersections of the scanning signal electric conductors 1 and image signal conductors 2; and switching transistors(TR) 4 have their source and drain terminals connected to the pixel electrodes 3 and image signal conductors 2 and their gate terminals connected to the scanning signal conductors 1. Plural image signal conductors 1 are short-circuited (2a) and plural scanning signal conductors 1 are also short-circuited (1a and 1b) while divided into plural groups so that adjacent scanning signal conductors are not in the same group (1a, 1b), and a scanning signal is inputted to the scanning signal conductors 1 in plural groups to perform inspection.