A charging and discharging system comprising a vehicle, a charging and discharging device and a cable which connects the vehicle and the charging and discharging device, wherein: the vehicle includes: an electric storage device configured to store DC power; a first fuse having a first terminal and a second terminal, the first terminal of the first fuse being connected to the electric storage device; a relay connected between the second terminal of the first fuse, and an inlet; the cable includes: a connector connected to the side of the inlet not connected to the relay; a second fuse having a first terminal and a second terminal, the first terminal of the second fuse being connected to the connector; and a power line ( PL11, NL11) connected between the second terminal of the second fuse and the charging and discharging device; and the charging and discharging device is configured to convert AC power supplied from a commercial AC power source into DC power and to supply the DC power to the electric storage device via the cable in a charging mode, the charging and discharging device being configured to convert DC power supplied from the electric storage device via the cable into AC power and to supply the AC power to a load in a discharging mode, wherein the vehicle further includes a controller configured to control the relay, the controller and the charging and discharging device are coupled to each other by a communication line, characterized in that the charging and discharging device is configured to transmit specification of the second fuse to the controller via the communication line before the discharging of the electric storage device is started, the controller is configured to determine whether the rated current of the first fuse, that is stored in advance in the memory of the controller, is smaller than the rated current of the second fuse, transmitted from the charging and discharging device, and the controller is configured to turn on the relay when the rated current of the first fuse is determined to be smaller than the rated current of the second fuse and to turn off the relay when the rated current of the first fuse is determined to be not smaller than the rated current of the second fuse. the vehicle includes: an electric storage device configured to store DC power; a first fuse having a first terminal and a second terminal, the first terminal of the first fuse being connected to the electric storage device; a relay connected between the second terminal of the first fuse, and an inlet; an electric storage device configured to store DC power; a first fuse having a first terminal and a second terminal, the first terminal of the first fuse being connected to the electric storage device; a relay connected between the second terminal of the first fuse, and an inlet; the cable includes: a connector connected to the side of the inlet not connected to the relay; a second fuse having a first terminal and a second terminal, the first terminal of the second fuse being connected to the connector; and a power line ( PL11, NL11) connected between the second terminal of the second fuse and the charging and discharging device; and a connector connected to the side of the inlet not connected to the relay; a second fuse having a first terminal and a second terminal, the first terminal of the second fuse being connected to the connector; and a power line ( PL11, NL11) connected between the second terminal of the second fuse and the charging and discharging device; and the charging and discharging device is configured to convert AC power supplied from a commercial AC power source into DC power and to supply the DC power to the electric storage device via the cable in a charging mode, the charging and discharging device being configured to convert DC power supplied from the electric storage device via the cable into AC power and to supply the AC power to a load in a discharging mode, wherein the vehicle further includes a controller configured to control the relay, the controller and the charging and discharging device are coupled to each other by a communication line, characterized in that the charging and discharging device is configured to transmit specification of the second fuse to the controller via the communication line before the discharging of the electric storage device is started, the controller is configured to determine whether the rated current of the first fuse, that is stored in advance in the memory of the controller, is smaller than the rated current of the second fuse, transmitted from the charging and discharging device, and the controller is configured to turn on the relay when the rated current of the first fuse is determined to be smaller than the rated current of the second fuse and to turn off the relay when the rated current of the first fuse is determined to be not smaller than the rated current of the second fuse.