A battery is protected without realizing the state of every vehicle element connected to the battery or the battery input/output current. A current limit value setting unit sets a current limit value for limiting the battery input/output current in accordance with state of the battery. A limiting current ratio calculation unit calculates a ratio of the current limit value set by the current limit value setting unit to a detected battery current value. A request limit coefficient calculation unit calculates a limit coefficient for limiting a request value for driving respective vehicle components based on the ratio calculated by the limiting current ratio calculation unit. In addition, a final request value calculation unit calculates as a final request value for the respective vehicle components, respective multiplication values resulting from multiplying the respective request values for the respective components by the limit coefficient calculated by the request limit coefficient calculation unit.