PURPOSE: To charge a liquid crystal into a liquid crystal display panel having a large display area without mixing air bubbles by using the capillary phenomenon to charge the liquid crystal into the gap part between two substrates and giving ultrasonic oscillation to both substrates.

CONSTITUTION: A charging hole 6 and an air discharge hole 7 are provided in positions facing each other on the outside circumference of the gap part between substrates 1 and 2 provided with plural linear transparent electrodes 3 and 4, and a liquid crystal 8 is charged into the gap part. In this case, the capillary phenomenon is used; and when the liquid crystal 8 is filled in the charging hole 6 and ultrasonic oscillation is given to substrates 1 and 2 by an ultrasonic oscillating machine 10, air bubbles 9 rise toward the air discharge hole 7 because of buoyancy or are made minute and are pressed up to the air discharge hole 7 together with the liquid crystal 8 because air bubbles 9 are easy to move in the liquid crystal, and they are discharged to the outside. Thus, air bubbles 9 are removed from the gap part, and the liquid crystal 8 is charged there.