An explosion-proof device, comprising: a frame having a hollow shape; at least one electrical component (18, 26, 28, 32, 34) disposed in the frame and comprising an explosion-proof logic circuit for performing an explosion-proof control; a battery comprising a plurality of secondary battery cells (24a, 24b, 24c), being disposed inside the frame and being capable of supplying the at least one electrical component with electric power; a protection device configured to stop power supply to the at least one electrical component from the battery, if a pressure inside the frame becomes not greater than a predetermined pressure value or if a pressure differential between inside and outside of the frame becomes not greater than a predetermined pressure differential value; an explosion-proof container housing the battery, inside the frame; a management device configured to manage the battery whereby state parameters of the plurality of secondary battery cells (24a, 24b, 24c) of the battery are monitored, wherein the plurality of secondary battery cells are connected in series with one another, wherein the protection device includes a switching relay disposed in the power line (L1, L2, L3, L4) between the battery and the at least one electrical component (18, 26, 28, 32, 34), and configured to be capable of blocking power supply to the at least one electrical component from the battery in response to a control signal of the explosion-proof logic circuit, and wherein the explosion-proof container houses the switching relay, along with the battery, wherein the management device has a power supply route which is provided independently from said power line (L1, L2, L3, L4) of the at least one electrical component to continue management of the battery by continuing to receive power supply from the battery even if said power line (L1, L2, L3, L4) is blocked by the explosion-proof logic circuit, wherein the explosion-proof container houses the management device. a frame having a hollow shape; at least one electrical component (18, 26, 28, 32, 34) disposed in the frame and comprising an explosion-proof logic circuit for performing an explosion-proof control; a battery comprising a plurality of secondary battery cells (24a, 24b, 24c), being disposed inside the frame and being capable of supplying the at least one electrical component with electric power; a protection device configured to stop power supply to the at least one electrical component from the battery, if a pressure inside the frame becomes not greater than a predetermined pressure value or if a pressure differential between inside and outside of the frame becomes not greater than a predetermined pressure differential value; an explosion-proof container housing the battery, inside the frame; a management device configured to manage the battery whereby state parameters of the plurality of secondary battery cells (24a, 24b, 24c) of the battery are monitored, wherein the plurality of secondary battery cells are connected in series with one another, wherein the protection device includes a switching relay disposed in the power line (L1, L2, L3, L4) between the battery and the at least one electrical component (18, 26, 28, 32, 34), and configured to be capable of blocking power supply to the at least one electrical component from the battery in response to a control signal of the explosion-proof logic circuit, and wherein the explosion-proof container houses the switching relay, along with the battery, wherein the management device has a power supply route which is provided independently from said power line (L1, L2, L3, L4) of the at least one electrical component to continue management of the battery by continuing to receive power supply from the battery even if said power line (L1, L2, L3, L4) is blocked by the explosion-proof logic circuit, wherein the explosion-proof container houses the management device.