A voltage detection device for detecting an output voltage of a fuel cell in which a plurality of cells (P1 - P55) are connected in series to output a desired voltage, wherein the plurality of cells (P1 - P55) are classified into N blocks (61-1 - 61-5), each block (61-1 - 61-5) including at least one cell, wherein N ≥ 2; the voltage detection device comprising: voltage detection sections (21-1 - 21-5) that are provided for the blocks (61-1 - 61-5) respectively and measure cell voltages in the blocks (61-1 - 61-5); and a control section that is connected to the voltage detection sections (21-1 - 21-5) through a communication line, outputs a voltage detection instruction to the respective voltage detection sections (21-1 - 21-5), and receives a voltage detection signal transmitted from each of the voltage detection sections (21-1 - 21-5); the voltage detection device characterized by further comprising M converters (42,44) that raise the voltage, which is supplied from a DC power source, to a voltage of a driving power source for the voltage detection section, wherein M ≤ N-1; wherein each of the M converters (42,44) is connected in one-to-one connection to an arbitrary block among the N blocks (61-1 - 61-5); wherein the control section supplies power from each of the converters (42,44) to the voltage detection section of the block corresponding to each of the converters (42,44) to operate the voltage detection section when the output of the fuel cell is initiated, and in a case where a voltage that is detected by at least one voltage detection section among the respective voltage detection sections (21-1 - 21-5) which operate by the power supplied from the respective converters (42,44), exceeds a predetermined threshold value, the control section controls at least one voltage detection section of a block corresponding to a converter to operate using the power supplied by the voltage of the block (61-1 - 61-5) and acquires the cell voltage in each of the blocks (61-1 -61-5). voltage detection sections (21-1 - 21-5) that are provided for the blocks (61-1 - 61-5) respectively and measure cell voltages in the blocks (61-1 - 61-5); and a control section that is connected to the voltage detection sections (21-1 - 21-5) through a communication line, outputs a voltage detection instruction to the respective voltage detection sections (21-1 - 21-5), and receives a voltage detection signal transmitted from each of the voltage detection sections (21-1 - 21-5); the voltage detection device characterized by further comprising M converters (42,44) that raise the voltage, which is supplied from a DC power source, to a voltage of a driving power source for the voltage detection section, wherein M ≤ N-1; wherein each of the M converters (42,44) is connected in one-to-one connection to an arbitrary block among the N blocks (61-1 - 61-5); wherein the control section supplies power from each of the converters (42,44) to the voltage detection section of the block corresponding to each of the converters (42,44) to operate the voltage detection section when the output of the fuel cell is initiated, and in a case where a voltage that is detected by at least one voltage detection section among the respective voltage detection sections (21-1 - 21-5) which operate by the power supplied from the respective converters (42,44), exceeds a predetermined threshold value, the control section controls at least one voltage detection section of a block corresponding to a converter to operate using the power supplied by the voltage of the block (61-1 - 61-5) and acquires the cell voltage in each of the blocks (61-1 -61-5).