An electrically driven vehicle equipped with a battery usable for running, a power generation unit of engine driven type that charges the battery being detachably mounted on a vehicle body, and the electrically driven vehicle including a connection part (43, 44, 60) that brings a first electric system in which the battery and the power generation unit are electrically connected together into a connected state in a state in which the power generation unit is mounted in a mounting position and brings the first electric system into a disconnected state in a state in which the power generation unit is dismounted from the mounting position, whereby the connection part (43, 44, 60) switches a connection state of the first electric system in accordance with installation or removal of the power generation unit, wherein the connection part (43, 44, 60) electrically connects the vehicle body and the power generation unit together in the state in which the power generation unit is mounted in the mounting position and brings a second electric system having a system voltage lower than that of the first electric system into a connected state and that brings the second electric system into a disconnected state, whereby the connection part (43, 44, 60) switches a connection state of the second electric system in accordance with installation or removal of the power generation unit, the electrically driven vehicle being characterised in that the connection part (43, 44, 60) is configured to bring the second electric system into the connected state prior to the first electric system when the power generation unit is mounted in the mounting position, the electrically driven vehicle further comprising a control unit that stops an operation of the power generation unit when the power generation unit is operating independently in a case where the second electric system is brought into the connected state. a power generation unit of engine driven type that charges the battery being detachably mounted on a vehicle body, and the electrically driven vehicle including a connection part (43, 44, 60) that brings a first electric system in which the battery and the power generation unit are electrically connected together into a connected state in a state in which the power generation unit is mounted in a mounting position and brings the first electric system into a disconnected state in a state in which the power generation unit is dismounted from the mounting position, whereby the connection part (43, 44, 60) switches a connection state of the first electric system in accordance with installation or removal of the power generation unit, wherein the connection part (43, 44, 60) electrically connects the vehicle body and the power generation unit together in the state in which the power generation unit is mounted in the mounting position and brings a second electric system having a system voltage lower than that of the first electric system into a connected state and that brings the second electric system into a disconnected state, whereby the connection part (43, 44, 60) switches a connection state of the second electric system in accordance with installation or removal of the power generation unit, the electrically driven vehicle being characterised in that the connection part (43, 44, 60) is configured to bring the second electric system into the connected state prior to the first electric system when the power generation unit is mounted in the mounting position, the electrically driven vehicle further comprising a control unit that stops an operation of the power generation unit when the power generation unit is operating independently in a case where the second electric system is brought into the connected state.