A data storage device and a method for manufacturing the data storage device provide a data storage device having a superior reliability and easy fabrication. The data storage device comprises a substrate including cell and peripheral circuit regions, a first conductive line on the peripheral circuit region, a peripheral contact plug between the substrate and the first conductive line, the peripheral contact plug being in contact with the first conductive line, a second conductive line on the cell region, a plurality of data storage structures between the substrate and the second conductive line, and a wiring structure between the substrate and each of the data storage structures and between the substrate and the peripheral contact plug. The first conductive line includes a bottom surface having a position from the substrate that is lower than a position of a bottom surface of the second conductive line.