A method for manufacturing a liquid crystal display device including a display panel provided with a first substrate, a second substrate, and liquid crystal, the method comprises: a first irradiation step of irradiating first positions of a first glass plate and a second glass plate with a laser beam having first irradiation energy; a second irradiation step of irradiating second positions of the first glass plate and the second glass plate with the laser beam having second irradiation energy higher than the first irradiation energy; and an etching step of exposing the display panel to an etching solution after the first irradiation step and the second irradiation step, such that the first positions are not cleaved, the second positions are cleaved, and at least a part of an outer periphery of each of the first substrate and the second substrate is formed.