A vehicle comprising: a vehicle body; an electromotive driving unit mounted on the vehicle body, the electromotive driving unit driven electrically; an engine operable with a liquid fuel; a generator (10, 20, 30) configured to generate electric power, the generator (10, 20, 30) driven by the engine; and a control device including a power generation control unit and an electric power output unit, the power generation control unit configured to output a signal for controlling the engine and the generator (10, 20, 30), the electric power output unit configured to output electric power generated by the generator (10, 20, 30) to the electromotive driving unit, wherein the control device in combination with the engine and the generator (10, 20, 30) forms a physically integrated engine generator unit, which, as a physically single body, is mountable to and dismountable from the vehicle body, and the control device is configured to direct the electric power output unit to output electric power to the electromotive driving unit without interposition of a battery while the engine generator unit is mounted on the vehicle body, and characterized in that a store visit prompting signal output unit of the control device is configured to output a store visit prompting signal indicating when the engine or the generator needs maintenance to an informing device while the engine generator unit is mounted on the vehicle body, the informing device prompting a visit to a store where the physically integrated engine generator unit is replaceable; and the generator (10, 20, 30) comprises a supply current adjustment unit (131, 341) configured to vary an inductance of a winding of the generator (10, 20, 30). a vehicle body; an electromotive driving unit mounted on the vehicle body, the electromotive driving unit driven electrically; an engine operable with a liquid fuel; a generator (10, 20, 30) configured to generate electric power, the generator (10, 20, 30) driven by the engine; and a control device including a power generation control unit and an electric power output unit, the power generation control unit configured to output a signal for controlling the engine and the generator (10, 20, 30), the electric power output unit configured to output electric power generated by the generator (10, 20, 30) to the electromotive driving unit, wherein the control device in combination with the engine and the generator (10, 20, 30) forms a physically integrated engine generator unit, which, as a physically single body, is mountable to and dismountable from the vehicle body, and the control device is configured to direct the electric power output unit to output electric power to the electromotive driving unit without interposition of a battery while the engine generator unit is mounted on the vehicle body, and characterized in that a store visit prompting signal output unit of the control device is configured to output a store visit prompting signal indicating when the engine or the generator needs maintenance to an informing device while the engine generator unit is mounted on the vehicle body, the informing device prompting a visit to a store where the physically integrated engine generator unit is replaceable; and the generator (10, 20, 30) comprises a supply current adjustment unit (131, 341) configured to vary an inductance of a winding of the generator (10, 20, 30).