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, wherein the earth leakage detection device further includes that the another end of the third resistor, R3, comprises a terminal of the third resistor, R3, configured to be applied to the predetermined fixed potential, said predetermined fixed potential being configured as switchable to a first fixed potential (Vcc) or to a second fixed potential, the first fixed potential (Vcc) being set to an upper limit potential of a measurement range of the voltage measurement unit, and the second fixed potential being set to a lower limit potential, and the earth leakage determination unit is configured to apply the second fixed potential to the terminal when a measured voltage sticks to an upper limit of the measurement range, and is configured to apply the first fixed potential (Vcc) to the terminal when the measured voltage sticks to a lower limit of the measurement range. 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, wherein the earth leakage detection device further includes that the another end of the third resistor, R3, comprises a terminal of the third resistor, R3, configured to be applied to the predetermined fixed potential, said predetermined fixed potential being configured as switchable to a first fixed potential (Vcc) or to a second fixed potential, the first fixed potential (Vcc) being set to an upper limit potential of a measurement range of the voltage measurement unit, and the second fixed potential being set to a lower limit potential, and the earth leakage determination unit is configured to apply the second fixed potential to the terminal when a measured voltage sticks to an upper limit of the measurement range, and is configured to apply the first fixed potential (Vcc) to the terminal when the measured voltage sticks to a lower limit of the measurement range. 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, wherein the earth leakage detection device further includes that the another end of the third resistor, R3, comprises a terminal of the third resistor, R3, configured to be applied to the predetermined fixed potential, said predetermined fixed potential being configured as switchable to a first fixed potential (Vcc) or to a second fixed potential, the first fixed potential (Vcc) being set to an upper limit potential of a measurement range of the voltage measurement unit, and the second fixed potential being set to a lower limit potential, and the earth leakage determination unit is configured to apply the second fixed potential to the terminal when a measured voltage sticks to an upper limit of the measurement range, and is configured to apply the first fixed potential (Vcc) to the terminal when the measured voltage sticks to a lower limit of the measurement range.