A manufacturing method of a display device includes providing a display panel including: a first area in which a plurality of pixels is arranged, a second area adjacent to the first area and at which the display panel is bendable, and a third area facing the first area with the second area therebetween; providing a circuit board electrically connected to the display panel at the third area; providing a first force to the third area of the display panel; and bending the second area of the display panel by the first force which is provided to the third area of the display panel.