A display device according to some exemplary embodiment includes: a display area; a non-display area surrounding the display area and including a sealing area; a first substrate including a center portion including a portion in the display area and an external portion including a portion in the sealing area; a second substrate including a center portion including a portion in the display area and an external portion including a portion in the sealing area; and a sealing portion between the first substrate and the second substrate and in the sealing area, wherein a thickness of the center portion of the first substrate is different from a thickness of the external portion of the first substrate, and a thickness of the center portion of the second substrate is different from a thickness of the external portion of the second substrate.