An electrically driven vehicle, comprising: a battery mounted inside a vehicle interior; an air intake duct which is provided with a cooling fan, and which is adapted to provide the battery with cooling air from the vehicle interior; an air discharge duct arranged to discharge, into the vehicle interior, air which was warmed after cooling the battery; a battery state detector that detects a state of the battery; a ventilation mechanism which comprises an outside air introduction mechanism (16, 17, 18, 19)that introduces outside air into the vehicle interior, and which ventilates air inside the vehicle interior; and a controller that starts and stops the ventilation mechanism, characterized in that: the battery is a lithium ion battery; the electrically driven vehicle comprises a gas discharge passage through which gas emitted from the lithium ion battery under abnormal conditions of the lithium ion battery is discharged into the vehicle interior; the ventilation mechanism comprises a window glass drive mechanism that moves a window glass in the vehicle interior; the controller includes a ventilation mechanism starting means that starts the ventilation mechanism when the lithium ion battery is determined to be in an abnormal state when a value showing the state of the lithium ion battery detected by the battery state detector exceeds a predetermined threshold, said ventilation mechanism starting means comprising an outside air introduction starting means and a window opening starting means that starts opening of the window glass by the window glass drive mechanism; and the battery state detector is any one of or a combination of any one of: a voltage sensor installed in the lithium ion battery, a temperature sensor installed in the lithium ion battery, a gas sensor (34, 35, 37, 38) installed in the gas discharge passage, and a gas temperature sensor (33, 36) installed in the gas discharge passage. a battery mounted inside a vehicle interior; an air intake duct which is provided with a cooling fan, and which is adapted to provide the battery with cooling air from the vehicle interior; an air discharge duct arranged to discharge, into the vehicle interior, air which was warmed after cooling the battery; a battery state detector that detects a state of the battery; a ventilation mechanism which comprises an outside air introduction mechanism (16, 17, 18, 19)that introduces outside air into the vehicle interior, and which ventilates air inside the vehicle interior; and a controller that starts and stops the ventilation mechanism, the battery is a lithium ion battery; the electrically driven vehicle comprises a gas discharge passage through which gas emitted from the lithium ion battery under abnormal conditions of the lithium ion battery is discharged into the vehicle interior; the ventilation mechanism comprises a window glass drive mechanism that moves a window glass in the vehicle interior; the controller includes a ventilation mechanism starting means that starts the ventilation mechanism when the lithium ion battery is determined to be in an abnormal state when a value showing the state of the lithium ion battery detected by the battery state detector exceeds a predetermined threshold, said ventilation mechanism starting means comprising an outside air introduction starting means and a window opening starting means that starts opening of the window glass by the window glass drive mechanism; and the battery state detector is any one of or a combination of any one of: a voltage sensor installed in the lithium ion battery, a temperature sensor installed in the lithium ion battery, a gas sensor (34, 35, 37, 38) installed in the gas discharge passage, and a gas temperature sensor (33, 36) installed in the gas discharge passage. a voltage sensor installed in the lithium ion battery, a temperature sensor installed in the lithium ion battery, a gas sensor (34, 35, 37, 38) installed in the gas discharge passage, and a gas temperature sensor (33, 36) installed in the gas discharge passage.