A polymer electrolyte membrane comprising: a first ion conductive polymer layer; and a second ion conductive polymer layer disposed on at least one surface of the first ion conductive polymer layer, wherein the first ion conductive polymer layer comprises a first ion conductive polymer comprising a sulfonic acid group, wherein the second ion conductive polymer layer comprises a second ion conductive polymer comprising a carboxylic acid group, wherein a thickness of the second ion conductive polymer layer is in a range of 1% to 80% of a thickness of the polymer electrolyte membrane, wherein the second ion conductive polymer layer comprises: a third ion conductive polymer layer disposed on at least one surface of the first ion conductive polymer layer; and a fourth ion conductive polymer layer disposed on one surface of the third ion conductive polymer layer, wherein the third ion conductive polymer layer comprises a third ion conductive polymer comprising the carboxylic acid group and the sulfonic acid group, and wherein the fourth ion conductive polymer layer comprises a fourth ion conductive polymer comprising the carboxylic acid group, and wherein the third ion conductive polymer layer has a first concentration gradient of the carboxylic acid group and a second concentration gradient of the sulfonic acid group. a first ion conductive polymer layer; and a second ion conductive polymer layer disposed on at least one surface of the first ion conductive polymer layer, wherein the first ion conductive polymer layer comprises a first ion conductive polymer comprising a sulfonic acid group, wherein the second ion conductive polymer layer comprises a second ion conductive polymer comprising a carboxylic acid group, wherein a thickness of the second ion conductive polymer layer is in a range of 1% to 80% of a thickness of the polymer electrolyte membrane, wherein the second ion conductive polymer layer comprises: a third ion conductive polymer layer disposed on at least one surface of the first ion conductive polymer layer; and a fourth ion conductive polymer layer disposed on one surface of the third ion conductive polymer layer, wherein the third ion conductive polymer layer comprises a third ion conductive polymer comprising the carboxylic acid group and the sulfonic acid group, and wherein the fourth ion conductive polymer layer comprises a fourth ion conductive polymer comprising the carboxylic acid group, and wherein the third ion conductive polymer layer has a first concentration gradient of the carboxylic acid group and a second concentration gradient of the sulfonic acid group. a third ion conductive polymer layer disposed on at least one surface of the first ion conductive polymer layer; and a fourth ion conductive polymer layer disposed on one surface of the third ion conductive polymer layer, wherein the third ion conductive polymer layer comprises a third ion conductive polymer comprising the carboxylic acid group and the sulfonic acid group, and wherein the fourth ion conductive polymer layer comprises a fourth ion conductive polymer comprising the carboxylic acid group, and wherein the third ion conductive polymer layer has a first concentration gradient of the carboxylic acid group and a second concentration gradient of the sulfonic acid group. <EOS>