A vehicle that utilizes electrical energy of a high voltage power source system including a high voltage battery, said vehicle comprising: a control unit 260 that carries out controls related to driving of said vehicle; a low voltage power source circuit that supplies electrical energy of a low voltage power source system including a low voltage battery to said control unit; a battery voltage measurement unit ( 250, 199) that measures a voltage level of the low voltage battery; and a converter unit that converts the electrical energy of the high voltage power source system into a low voltage and charges the low voltage battery with the converted low voltage electrical energy; said vehicle further comprising a motor (MG1, MG2) that outputs power required for driving the vehicle, the high voltage battery being used as an energy source for driving said motor, wherein said control unit carries out controls for driving said motor ( MG1, MG2) wherein the vehicle further comprises: a connection unit that receives power supply from the low voltage power source system, is actuated by part of the control unit, and connects the high voltage battery to the high voltage power source system including said converter unit; and a recovery unit that, when the observed voltage of the low voltage battery is lower than a preset minimum reference voltage (Vmin) and higher than an operation inhibiting reference voltage (Vinh) at which the connection unit is operable, at the time of a requirement to start said vehicle, activates said connection unit to supply the electrical energy of the high voltage power source system to said converter unit to recover the voltage of the low voltage battery to the preset minimum reference voltage, prior to a permission to operate said control unit. a control unit 260 that carries out controls related to driving of said vehicle; a low voltage power source circuit that supplies electrical energy of a low voltage power source system including a low voltage battery to said control unit; a battery voltage measurement unit ( 250, 199) that measures a voltage level of the low voltage battery; and a converter unit that converts the electrical energy of the high voltage power source system into a low voltage and charges the low voltage battery with the converted low voltage electrical energy; said vehicle further comprising a motor (MG1, MG2) that outputs power required for driving the vehicle, the high voltage battery being used as an energy source for driving said motor, wherein said control unit carries out controls for driving said motor ( MG1, MG2) wherein the vehicle further comprises: a connection unit that receives power supply from the low voltage power source system, is actuated by part of the control unit, and connects the high voltage battery to the high voltage power source system including said converter unit; and a recovery unit that, when the observed voltage of the low voltage battery is lower than a preset minimum reference voltage (Vmin) and higher than an operation inhibiting reference voltage (Vinh) at which the connection unit is operable, at the time of a requirement to start said vehicle, activates said connection unit to supply the electrical energy of the high voltage power source system to said converter unit to recover the voltage of the low voltage battery to the preset minimum reference voltage, prior to a permission to operate said control unit. a connection unit that receives power supply from the low voltage power source system, is actuated by part of the control unit, and connects the high voltage battery to the high voltage power source system including said converter unit; and a recovery unit that, when the observed voltage of the low voltage battery is lower than a preset minimum reference voltage (Vmin) and higher than an operation inhibiting reference voltage (Vinh) at which the connection unit is operable, at the time of a requirement to start said vehicle, activates said connection unit to supply the electrical energy of the high voltage power source system to said converter unit to recover the voltage of the low voltage battery to the preset minimum reference voltage, prior to a permission to operate said control unit.