A vehicle is equipped with a main battery, an auxiliary machinery battery, a high-capacitance DC/DC converter which converts power on an electric path between the main battery and a motor-generator for traveling to supply the converted power to the auxiliary machinery battery, a low-capacitance sub power supply which converts power on an electric path between the main battery and an external power supply to supply the converted power to the auxiliary machinery battery, and a control device which controls the sub power supply. The control device determines whether or not the DC/DC converter has an abnormality, and operates the sub power supply to perform precharging when it is determined that the DC/DC converter is abnormal. An auxiliary machinery battery voltage V2 when precharging has been performed is set to a value which is higher by a predetermined voltage a than an auxiliary machinery battery voltage V1 when precharging has not been performed.