A monitoring device for a secondary battery comprising: a control part configured to: detect whether a use state of the secondary battery is a first use state or a second use state; detect presence or absence of a signal, indicating an ON operation of an ignition switch; detect presence or absence of a charge-discharge current of the secondary battery; set a first protection condition for the secondary battery, in case the control part has detected the secondary battery to be in the first use state; and set a second protection condition for the secondary battery, in case the control part has detected the secondary battery to be in the second use state; wherein the control part is further configured to: notify, in case the first protection condition is set for the secondary battery, a vehicle electronic control unit, ECU, that a condition for interrupting the charge-discharge current of the secondary battery is established, so that in response to the notification, the vehicle ECU gives warning allowing a user to move the vehicle to a safe place in a prescribed period, if a voltage or an SOC of the secondary battery reaches a first upper limit value, and after the prescribed time period, send an interruption command to a current interruption device for interrupting the charge-discharge current of the secondary battery; and send, in case the second protection condition is set for the secondary battery, an interruption command to the current interruption device for interrupting the charge-discharge current of the secondary battery, if a voltage or an SOC of the secondary battery reaches a second upper limit value; wherein the first upper limit value is lower than the second upper limit value; wherein the first use state relates to a case where the signal, indicating the ON operation of the ignition switch, and the charge-discharge current are present; and wherein the second use state relates to a case where at least one of the signal, indicating the ON operation of the ignition switch, and the charge-discharge current is absent. detect whether a use state of the secondary battery is a first use state or a second use state; detect presence or absence of a signal, indicating an ON operation of an ignition switch; detect presence or absence of a charge-discharge current of the secondary battery; set a first protection condition for the secondary battery, in case the control part has detected the secondary battery to be in the first use state; and set a second protection condition for the secondary battery, in case the control part has detected the secondary battery to be in the second use state; wherein the control part is further configured to: notify, in case the first protection condition is set for the secondary battery, a vehicle electronic control unit, ECU, that a condition for interrupting the charge-discharge current of the secondary battery is established, so that in response to the notification, the vehicle ECU gives warning allowing a user to move the vehicle to a safe place in a prescribed period, if a voltage or an SOC of the secondary battery reaches a first upper limit value, and after the prescribed time period, send an interruption command to a current interruption device for interrupting the charge-discharge current of the secondary battery; and send, in case the second protection condition is set for the secondary battery, an interruption command to the current interruption device for interrupting the charge-discharge current of the secondary battery, if a voltage or an SOC of the secondary battery reaches a second upper limit value; wherein the first upper limit value is lower than the second upper limit value; wherein the first use state relates to a case where the signal, indicating the ON operation of the ignition switch, and the charge-discharge current are present; and wherein the second use state relates to a case where at least one of the signal, indicating the ON operation of the ignition switch, and the charge-discharge current is absent. notify, in case the first protection condition is set for the secondary battery, a vehicle electronic control unit, ECU, that a condition for interrupting the charge-discharge current of the secondary battery is established, so that in response to the notification, the vehicle ECU gives warning allowing a user to move the vehicle to a safe place in a prescribed period, if a voltage or an SOC of the secondary battery reaches a first upper limit value, and after the prescribed time period, send an interruption command to a current interruption device for interrupting the charge-discharge current of the secondary battery; and send, in case the second protection condition is set for the secondary battery, an interruption command to the current interruption device for interrupting the charge-discharge current of the secondary battery, if a voltage or an SOC of the secondary battery reaches a second upper limit value; wherein the first upper limit value is lower than the second upper limit value; wherein the first use state relates to a case where the signal, indicating the ON operation of the ignition switch, and the charge-discharge current are present; and wherein the second use state relates to a case where at least one of the signal, indicating the ON operation of the ignition switch, and the charge-discharge current is absent.