An earth leakage detection device, comprising: a coupling capacitor, Cc, including one end connected to a current path of a power storage unit, the power storage unit being connected to a load in a state of being insulated from a ground; a voltage output unit that is configured to generate a periodically changing periodic voltage and is configured to apply the periodically changing periodic voltage to another end of the coupling capacitor, Cc, via a first resistor, R1; a second resistor, R2, connected in series between (i) a node, A, said node located between the coupling capacitor, Cc, and the first resistor, R1, and (ii) an end of a third resistor, R3, another end of the third resistor, R3, being connected to a predetermined fixed potential; characterized in that, the earth leakage detection device further comprises: a voltage measurement unit that is configured to measure a voltage at a voltage dividing point between the second resistor, R2, and the third resistor, R3; and an earth leakage determination unit that is configured to determine whether or not a leakage occurs between the current path of the power storage unit and the ground based on the voltage measured by the voltage measurement unit, and wherein the fixed potential is set to an intermediate potential of a measurement range of the voltage measurement unit, and resistance values of the second and third resistors are configured such that a ratio of a first resistance value of the third resistor, R3, and a second resistance value of the second resistor, R2, is a voltage dividing ratio, the voltage dividing ratio comprising a ratio of a voltage measurement range of the voltage measurement unit at the voltage dividing point, between the second resistor, R2, and the third resistor, R3, and a voltage range at the node, A, between the coupling capacitor, Cc, and the first resistor, R1, and, wherein, the earth leakage detection device, further comprises a switch connected between the third resistor, R3, and the fixed potential, wherein, when the switch is in an ON state, the earth leakage determination unit is configured to multiply a voltage measured by voltage measurement unit at the voltage dividing point, by a magnification corresponding to the voltage dividing ratio, to obtain a restored voltage, and, wherein, the earth leakage determination unit is further configured to turn the switch to an OFF state, when an entire amplitude of the restored voltage falls within the measurement range of the voltage measurement unit, and, wherein, the earth leakage determination unit is further configured to turn the switch to an ON state, when an entire amplitude of the restored voltage does not fall within the measurement range of the voltage measurement unit. a coupling capacitor, Cc, including one end connected to a current path of a power storage unit, the power storage unit being connected to a load in a state of being insulated from a ground; a voltage output unit that is configured to generate a periodically changing periodic voltage and is configured to apply the periodically changing periodic voltage to another end of the coupling capacitor, Cc, via a first resistor, R1; a second resistor, R2, connected in series between (i) a node, A, said node located between the coupling capacitor, Cc, and the first resistor, R1, and (ii) an end of a third resistor, R3, another end of the third resistor, R3, being connected to a predetermined fixed potential; characterized in that, the earth leakage detection device further comprises: a voltage measurement unit that is configured to measure a voltage at a voltage dividing point between the second resistor, R2, and the third resistor, R3; and an earth leakage determination unit that is configured to determine whether or not a leakage occurs between the current path of the power storage unit and the ground based on the voltage measured by the voltage measurement unit, and wherein the fixed potential is set to an intermediate potential of a measurement range of the voltage measurement unit, and resistance values of the second and third resistors are configured such that a ratio of a first resistance value of the third resistor, R3, and a second resistance value of the second resistor, R2, is a voltage dividing ratio, the voltage dividing ratio comprising a ratio of a voltage measurement range of the voltage measurement unit at the voltage dividing point, between the second resistor, R2, and the third resistor, R3, and a voltage range at the node, A, between the coupling capacitor, Cc, and the first resistor, R1, and, wherein, the earth leakage detection device, further comprises a switch connected between the third resistor, R3, and the fixed potential, wherein, when the switch is in an ON state, the earth leakage determination unit is configured to multiply a voltage measured by voltage measurement unit at the voltage dividing point, by a magnification corresponding to the voltage dividing ratio, to obtain a restored voltage, and, wherein, the earth leakage determination unit is further configured to turn the switch to an OFF state, when an entire amplitude of the restored voltage falls within the measurement range of the voltage measurement unit, and, wherein, the earth leakage determination unit is further configured to turn the switch to an ON state, when an entire amplitude of the restored voltage does not fall within the measurement range of the voltage measurement unit.