A voltage monitoring circuit for a storage unit including: N electric storage cells connected in series, each including a given number of electric storage elements; and a current breaking switch (3,14) interposed between at least a pair of adjacent electric storage cells of the N electric storage cells, wherein a side of a lower electric potential of the N electric storage cells is connected via an electric load with a side of a higher electric potential of the N electric storage cells which are connected in series, wherein the voltage monitoring circuit comprises: a monitor circuit adapted to detect a voltage of each of N resistance elements connected in series; wherein N+1 wires (P1, P2, P3, P4, P5) connect each terminal of the N resistance elements connected in series with a corresponding terminal of one of the N electric storage cells connected in series; and N switching elements (5a, 5b, 5c, 5d), wherein each switching element is connected in series with one of N wires (P1, P2, P3, P4 or P2, P3, P4, P5) that are selected from the N+1 wires (P1, P2, P3, P4, P5) by skipping the wire with the maximum electric potential or the wire with the minimum electric potential of the N+1 wires (P1, P2, P3, P4, P5), wherein one switching element of the N switching elements (5a, 5b, 5c, 5d) is adapted to be switched on according to the electric potential between a corresponding resistance element and another switching element, which another switching element is connected in series with a wire which is adjacent to the one switching element of the N switching elements (5a, 5b, 5c, 5d). N electric storage cells connected in series, each including a given number of electric storage elements; and a current breaking switch (3,14) interposed between at least a pair of adjacent electric storage cells of the N electric storage cells, wherein a side of a lower electric potential of the N electric storage cells is connected via an electric load with a side of a higher electric potential of the N electric storage cells which are connected in series, wherein the voltage monitoring circuit comprises: a monitor circuit adapted to detect a voltage of each of N resistance elements connected in series; wherein N+1 wires (P1, P2, P3, P4, P5) connect each terminal of the N resistance elements connected in series with a corresponding terminal of one of the N electric storage cells connected in series; and N switching elements (5a, 5b, 5c, 5d), wherein each switching element is connected in series with one of N wires (P1, P2, P3, P4 or P2, P3, P4, P5) that are selected from the N+1 wires (P1, P2, P3, P4, P5) by skipping the wire with the maximum electric potential or the wire with the minimum electric potential of the N+1 wires (P1, P2, P3, P4, P5), wherein one switching element of the N switching elements (5a, 5b, 5c, 5d) is adapted to be switched on according to the electric potential between a corresponding resistance element and another switching element, which another switching element is connected in series with a wire which is adjacent to the one switching element of the N switching elements (5a, 5b, 5c, 5d). a monitor circuit adapted to detect a voltage of each of N resistance elements connected in series; wherein N+1 wires (P1, P2, P3, P4, P5) connect each terminal of the N resistance elements connected in series with a corresponding terminal of one of the N electric storage cells connected in series; and N switching elements (5a, 5b, 5c, 5d), wherein each switching element is connected in series with one of N wires (P1, P2, P3, P4 or P2, P3, P4, P5) that are selected from the N+1 wires (P1, P2, P3, P4, P5) by skipping the wire with the maximum electric potential or the wire with the minimum electric potential of the N+1 wires (P1, P2, P3, P4, P5), wherein one switching element of the N switching elements (5a, 5b, 5c, 5d) is adapted to be switched on according to the electric potential between a corresponding resistance element and another switching element, which another switching element is connected in series with a wire which is adjacent to the one switching element of the N switching elements (5a, 5b, 5c, 5d).