An apparatus for measuring a battery cell voltage, comprising: a battery having a cell group; a first switching unit for selectively connecting both terminals of each battery cell (VB 1 ∼ VB4) of the cell group to first and second conductive lines (1, 2); a first voltage charging unit connected between the first and second conductive lines (1, 2) to primarily charge a cell voltage; a second voltage charging unit electrically connected to the first voltage charging unit for relaying the charged voltage stored in the first voltage charging unit such that the relayed voltage is secondarily charged to the second voltage charging unit; a cell voltage sensing unit for sensing the voltage charged in the second voltage charging unit; and a second switching unit connected between the first and second voltage charging units (320, 330) and configured to connect the first and second voltage charging units (320, 330) in a charged voltage relaying mode and isolate the first and second voltage charging units (320, 330) from each other in a charged voltage sensing mode; characterized in that: the second voltage charging unit includes: a first capacitor inserted in the first conductive line and a second capacitor inserted in the second conductive line, wherein the first and second capacitor (C1, C2) are connected to the second switching unit; and a first switch connected between the first and the second conductive lines (1, 2) at the side of the second switching unit based on the first and second capacitors (C1, C2) and a second switch connected between the first and the second conductive lines (1, 2) at the side of the cell voltage sensing unit based on the first and second capacitor (C1, C2), wherein in the charged voltage relaying mode the first and second switches (SW1, SW2) are configured to turn off and turn on, respectively, and in the charged voltage sensing mode the first and second switches (SW1, SW2) are configured to turn on and turn off, respectively. a battery having a cell group; a first switching unit for selectively connecting both terminals of each battery cell (VB 1 ∼ VB4) of the cell group to first and second conductive lines (1, 2); a first voltage charging unit connected between the first and second conductive lines (1, 2) to primarily charge a cell voltage; a second voltage charging unit electrically connected to the first voltage charging unit for relaying the charged voltage stored in the first voltage charging unit such that the relayed voltage is secondarily charged to the second voltage charging unit; a cell voltage sensing unit for sensing the voltage charged in the second voltage charging unit; and a second switching unit connected between the first and second voltage charging units (320, 330) and configured to connect the first and second voltage charging units (320, 330) in a charged voltage relaying mode and isolate the first and second voltage charging units (320, 330) from each other in a charged voltage sensing mode; characterized in that: the second voltage charging unit includes: a first capacitor inserted in the first conductive line and a second capacitor inserted in the second conductive line, wherein the first and second capacitor (C1, C2) are connected to the second switching unit; and a first switch connected between the first and the second conductive lines (1, 2) at the side of the second switching unit based on the first and second capacitors (C1, C2) and a second switch connected between the first and the second conductive lines (1, 2) at the side of the cell voltage sensing unit based on the first and second capacitor (C1, C2), wherein in the charged voltage relaying mode the first and second switches (SW1, SW2) are configured to turn off and turn on, respectively, and in the charged voltage sensing mode the first and second switches (SW1, SW2) are configured to turn on and turn off, respectively. a first capacitor inserted in the first conductive line and a second capacitor inserted in the second conductive line, wherein the first and second capacitor (C1, C2) are connected to the second switching unit; and a first switch connected between the first and the second conductive lines (1, 2) at the side of the second switching unit based on the first and second capacitors (C1, C2) and a second switch connected between the first and the second conductive lines (1, 2) at the side of the cell voltage sensing unit based on the first and second capacitor (C1, C2), wherein in the charged voltage relaying mode the first and second switches (SW1, SW2) are configured to turn off and turn on, respectively, and in the charged voltage sensing mode the first and second switches (SW1, SW2) are configured to turn on and turn off, respectively.