An electric storage system comprising: an electric storage apparatus performing charge and discharge; a load ( 22, 23, 24) receiving power from the electric storage apparatus to operate; a charger supplying power from an external power source to the electric storage apparatus and supplying the power of the electric storage apparatus to an external device; and a system main relay ( SMR-B, SMR-G, SMR-P) allowing connection between the electric storage apparatus and the load ( 22, 23, 24); a charge relay ( CHR1, CHR2, CHR3) allowing connection between the electric storage apparatus and the charger; wherein the system main relay ( SMR-B, SMR-G, SMR-P) includes a first system main relay ( SMR-G) and a second system main relay ( SMR-B) allowing connection between a positive electrode terminal and a negative electrode terminal of the electric storage apparatus and the load ( 22, 23, 24), respectively, and a third system main relay ( SMR-P) connected in series with a current limiting resistor and, together with the current limiting resistor, connected in parallel with the first system main relay ( SMR-G), the charge relay ( CHR1, CHR2, CHR3) includes a first charge relay and a second charge relay allowing connection between the positive electrode terminal and the negative electrode terminal of the electric storage apparatus and the charger, respectively, and a third charge relay connected in series with the current limiting resistor and, together with the current limiting resistor, connected in parallel with the first charge relay, characterised in that one end of the current limiting resistor is connected to the third system main relay ( SMR-P), and the other end of the current limiting resistor is connected to a connection line between the electric storage apparatus and the first system main relay ( SMR-G), one end of the first charge relay is connected to the connection line between the electric storage apparatus and the first system main relay ( SMR-G), one end of the second charge relay is connected to a connection line between the electric storage apparatus and the second system main relay ( SMR-B), one end of the third charge relay is connected to the connection line between the current limiting resistor and the third system main relay ( SMR-P), and the other ends of the first charge relay, the second charge relay and the third charge relay are connected to the charger. an electric storage apparatus performing charge and discharge; a load ( 22, 23, 24) receiving power from the electric storage apparatus to operate; a charger supplying power from an external power source to the electric storage apparatus and supplying the power of the electric storage apparatus to an external device; and a system main relay ( SMR-B, SMR-G, SMR-P) allowing connection between the electric storage apparatus and the load ( 22, 23, 24); a charge relay ( CHR1, CHR2, CHR3) allowing connection between the electric storage apparatus and the charger; wherein the system main relay ( SMR-B, SMR-G, SMR-P) includes a first system main relay ( SMR-G) and a second system main relay ( SMR-B) allowing connection between a positive electrode terminal and a negative electrode terminal of the electric storage apparatus and the load ( 22, 23, 24), respectively, and a third system main relay ( SMR-P) connected in series with a current limiting resistor and, together with the current limiting resistor, connected in parallel with the first system main relay ( SMR-G), the charge relay ( CHR1, CHR2, CHR3) includes a first charge relay and a second charge relay allowing connection between the positive electrode terminal and the negative electrode terminal of the electric storage apparatus and the charger, respectively, and a third charge relay connected in series with the current limiting resistor and, together with the current limiting resistor, connected in parallel with the first charge relay, characterised in that one end of the current limiting resistor is connected to the third system main relay ( SMR-P), and the other end of the current limiting resistor is connected to a connection line between the electric storage apparatus and the first system main relay ( SMR-G), one end of the first charge relay is connected to the connection line between the electric storage apparatus and the first system main relay ( SMR-G), one end of the second charge relay is connected to a connection line between the electric storage apparatus and the second system main relay ( SMR-B), one end of the third charge relay is connected to the connection line between the current limiting resistor and the third system main relay ( SMR-P), and the other ends of the first charge relay, the second charge relay and the third charge relay are connected to the charger.