A voltage detection apparatus for a battery module which comprises a plurality of blocks, each block comprising a plurality of cells connected in series, said voltage detection apparatus comprising: a plurality of voltage detection units, each voltage detection unit being configured to detect cell voltages of the cells in a corresponding one of the plurality of blocks, wherein each of the plurality of voltage detection units is supplied with power via a power supply line connected to the respective block; and wherein each of the plurality of voltage detection units is provided with a current increase unit (25, 96) for increasing a dark current which is a current flowing through the voltage detection unit when the voltage detection unit is in a sleep state, characterized by a dark current adjustment unit that adjusts the dark current flowing through each of the plurality of voltage detection units; and a plurality of current detection units, each current detection unit being configured to detect the dark current flowing through a respective one of the plurality of voltage detection units, wherein the dark current adjustment unit comprises: a target value setting unit (84, 85) configured to set a target value based on the dark currents detected by the plurality of current detection units; and a current control unit which controls the plurality of current increase units (25, 96) so that the dark current flowing through each of the plurality of voltage detection units becomes the target value which is the same for all voltage detection units. a plurality of voltage detection units, each voltage detection unit being configured to detect cell voltages of the cells in a corresponding one of the plurality of blocks, wherein each of the plurality of voltage detection units is supplied with power via a power supply line connected to the respective block; and wherein each of the plurality of voltage detection units is provided with a current increase unit (25, 96) for increasing a dark current which is a current flowing through the voltage detection unit when the voltage detection unit is in a sleep state, characterized by a dark current adjustment unit that adjusts the dark current flowing through each of the plurality of voltage detection units; and a plurality of current detection units, each current detection unit being configured to detect the dark current flowing through a respective one of the plurality of voltage detection units, wherein the dark current adjustment unit comprises: a target value setting unit (84, 85) configured to set a target value based on the dark currents detected by the plurality of current detection units; and a current control unit which controls the plurality of current increase units (25, 96) so that the dark current flowing through each of the plurality of voltage detection units becomes the target value which is the same for all voltage detection units. a target value setting unit (84, 85) configured to set a target value based on the dark currents detected by the plurality of current detection units; and a current control unit which controls the plurality of current increase units (25, 96) so that the dark current flowing through each of the plurality of voltage detection units becomes the target value which is the same for all voltage detection units.