A display device including a display module configured to display an image, a printed circuit board provided below the display module, and a flexible substrate including a first bonding region, a bending region, and a second bonding region. The flexible substrate may be bent at the bending region and may be used to connect the display module to the printed circuit board. The flexible substrate may include a circuit layer electrically connecting the display module to the printed circuit board, a cover layer on the circuit layer, and a bubble-prevention layer, which is provided between the cover layer and the circuit layer and is overlapped with each of the first and second bonding regions of the flexible substrate.