A voltage measurement device includes: a charging circuit 100 having a first switch group of semiconductor elements P1, P2 for connecting voltages of respective blocks, into which a plurality of voltage sources V.sub.Cn are divided, to a charging condenser C.sub.n and a second switch groups of semiconductor elements N3, N4 for connecting the voltage of each block accumulated in the charging condenser C.sub.n to an output terminal; an A/D converter 120 connected to an output terminal of the charging circuit 100; and a CPU 130 measuring a stray capacitance including a parasitic capacitance of the semiconductor element N4 in advance and further calculates an error voltage due to electrical charges accumulated in the parasitic capacitance. The CPU 130 further calculates a true value of the voltage of each block by subtracting the error voltage from a measured value of terminal voltage at the output terminal of the charging circuit 100.