The present invention can easily inspect the connection between a flexible printed circuit board and terminals. In a display device which includes a display panel which forms a plurality of lines as first lines on a terminal portion thereof, and a film-like substrate which forms a plurality of lines as second lines thereon, the display panel has a determination terminal which is arranged close to the terminal portion, has a width larger than a width of the terminal, and has a portion thereof removed, the film-like substrate forms third lines and fourth lines arranged close to the second lines thereon, the third lines face the determination terminal, and the fourth lines face the removed portion of the determination terminal from which the portion is removed.