Display device and manufacturing method thereof wherein the glass substrate can be easily cut even if a resin substrate lamination is present

The present invention aims to provide a manufacturing method of glass substrate which can be easily cut even if a resin substrate lamination is present, and a display device manufactured by the method. A first rib layer 8 containing an inorganic material is formed in the first frame region 108 of a first glass substrate 100. After the first rib layer 8 is formed, a first resin layer 6 is formed on at least a plurality of first product regions M1. A first functional layer 7 is formed on the first rib layer 8 and the first resin layer 6 to include a self-luminous element layer 33 which emits light by controlling the brightness of the plurality of unit pixels constituting an image, and a sealing layer 40 covering the self-luminous element layer 33. The first rib layer 8 and the first functional layer 7 are cut by using a line C passing through the plurality of first product areas M1 while avoiding the first frame region 108 in such a manner that the plurality of first product areas M1 are separated from each oth