Mother substrate for display device, display device, and method for manufacturing display device

The invention relates to a mother substrate for a display device, a display device, and a method for manufacturing the display device. According to one embodiment, a mother substrate is provided with: a substrate having a linear first side; a plurality of panel parts; the blank part is closer to the outer side than the panel part; and a first partition wall having a first lower portion disposed in the blank portion and a first upper portion disposed above the first lower portion and protruding from a side surface of the first lower portion, the first partition wall having a shape that is not orthogonal to an extending direction of the first side. 本发明涉及显示装置用的母基板、显示装置及显示装置的制造方法。根据一实施方式，母基板具备：具有直线状的第一边的基板；多个面板部；比所述面板部靠外侧的空白部；第一隔壁，其具有配置在所述空白部的第一下部和配置在所述第一下部之上且从所述第一下部的侧面突出的第一上部，所述第一隔壁具有相对于所述第一边的延伸方向不正交的形状。