A display device of this invention, includes a front case including a touch panel; and a rear case including a lock unit, which is configured to regulate movement of the front case, and a display unit, in which the front case is mounted to the rear case by inserting a protrusion that is formed in a peripheral edge portion of the front case into a guide groove that is formed in an outer edge portion of the rear case to bring the front case into contact with the rear case, subsequently moving the front case along the guide groove to engage the protrusion with the guide groove, and moving the lock unit of in the rear case from a first position to a second position, which is different from the first position, to regulate the movement of the front case.