An adhesive-film exfoliating device includes an absorption stage 6 for absorbing a liquid crystal display panel 4 in which a polarizing plate 3 is adhered to a glass plate 2, a clamping unit 7 for clamping a corner 3a of the polarizing plate 3 exfoliated from the glass plate 2 and a ball screw shaft 11 for moving the absorption stage 6 relatively to the clamping unit 7. A ball screw nut 14 in screw-engagement with the ball screw shaft 11 is fixed on a back surface of the absorption stage 6. With the rotation of the ball screw shaft 11, the absorption stage 6 integral with the ball screw nut 14 is slid in a direction to exfoliate the polarizing plate 3 exfoliated from the glass plate 2. In a manufacturing method of the liquid crystal display panel 4, a process of exfoliating the polarizing plate 3 from the glass plate 2 includes steps of moving the absorption stage 6 while allowing the clamping unit 7 to clamp the corner 3a of the polarizing plate 3.