A display device includes a substrate (SUB) including a first pixel region (A1), a second pixel region (A2) having an area smaller than that of the first pixel region, and a peripheral region (PPA) surrounding the first pixel region and the second pixel region, a second pixel (PXL2) provided in the second pixel region, a second line (PL2) connected to the second pixel, an extension line (ELP) extended to the peripheral region, a dummy part (DMP) located in the peripheral region to overlap with the extension line, a power line (PL) connected to the first and second pixel regions, and a connection line (CNL) located in the peripheral region to be connected to the dummy part, the connection line being electrically connected to a portion of the second pixel region, wherein the second pixel region includes a first sub-pixel region (s1_PXA2) connected to the connection line and a second sub-pixel region (s2_PXA2) except the first sub-pixel region.