An organic light emitting display device having a mirror function, the device comprising: a substrate comprising a display area (DA) and a peripheral area (PA); and a first reflective member positioned in both the display area (DA) and the peripheral area (PA), the first reflective member comprising: a plurality of first openings formed in a light-emitting region (A) of the display area (DA); and a plurality of second openings formed in the peripheral area (PA), wherein the peripheral area (PA) is arranged outside the display area (DA), and wherein the first reflective member comprises: a first reflective portion disposed in the display area (DA); a second reflective portion disposed in the peripheral area (PA) and integrally formed with the first reflective portion ; and the shape, size and number of the second openings is configured such that the reflectivity of the second reflective portion is equal to the reflectivity of the first reflective portion, characterized in that the second openings have a different shape or size from the first openings. a substrate comprising a display area (DA) and a peripheral area (PA); and a first reflective member positioned in both the display area (DA) and the peripheral area (PA), the first reflective member comprising: a plurality of first openings formed in a light-emitting region (A) of the display area (DA); and a plurality of second openings formed in the peripheral area (PA), wherein the peripheral area (PA) is arranged outside the display area (DA), and wherein the first reflective member comprises: a first reflective portion disposed in the display area (DA); a second reflective portion disposed in the peripheral area (PA) and integrally formed with the first reflective portion ; and the shape, size and number of the second openings is configured such that the reflectivity of the second reflective portion is equal to the reflectivity of the first reflective portion, characterized in that the second openings have a different shape or size from the first openings. a plurality of first openings formed in a light-emitting region (A) of the display area (DA); and a plurality of second openings formed in the peripheral area (PA), wherein the peripheral area (PA) is arranged outside the display area (DA), and wherein the first reflective member comprises: a first reflective portion disposed in the display area (DA); a second reflective portion disposed in the peripheral area (PA) and integrally formed with the first reflective portion ; and the shape, size and number of the second openings is configured such that the reflectivity of the second reflective portion is equal to the reflectivity of the first reflective portion, characterized in that the second openings have a different shape or size from the first openings. a first reflective portion disposed in the display area (DA); a second reflective portion disposed in the peripheral area (PA) and integrally formed with the first reflective portion ; and the shape, size and number of the second openings is configured such that the reflectivity of the second reflective portion is equal to the reflectivity of the first reflective portion, characterized in that the second openings have a different shape or size from the first openings. <EOS>