A lighting device for use in a vehicle to illuminate an inside of a cabin of the vehicle, comprising: a lighting fixture suited for irradiating the inside of the cabin in order to irradiate the inside of the cabin as a whole over the longitudinal direction of the vehicle; a power supply to supply electric power to said lighting fixture; and a storage battery to be charged by electric power from said power supply, wherein said lighting fixture includes a first light source which is lighted at a first illuminance, and a second light source which is lighted at a second illuminance lower than the first illuminance, characterized in that said first light source and said second light source are included in the same lighting fixture; wherein said first light source is disposed on one side of the lighting fixture that extends in the longitudinal direction thereof, being located closer to the inside of the cabin than a center line of the lighting fixture, wherein the second light source is disposed on the other side of the lighting fixture that extends in the longitudinal direction thereof, being located closer to an outside of the cabin than the center line of the lighting fixture; wherein an irradiation direction of said first light source as a main illuminant is specified to be a direction toward a center of the ceiling of the cabin, wherein an irradiation direction of said second light source as an auxiliary illuminator is specified to be a different direction from that of the first light source and toward a lower portion of a side wall of the cabin; wherein said first light source is adapted to receive an alternating current that is provided from said power supply, while said second light source is adapted to receive a direct current that is provided from said storage battery, and wherein in an emergency, when power fed from said power supply is shut off, the second light source continues to receive the direct current from said storage battery and continues to illuminate at the second illuminance, allowing passengers to identify their feet. a lighting fixture suited for irradiating the inside of the cabin in order to irradiate the inside of the cabin as a whole over the longitudinal direction of the vehicle; a power supply to supply electric power to said lighting fixture; and a storage battery to be charged by electric power from said power supply, wherein said lighting fixture includes a first light source which is lighted at a first illuminance, and a second light source which is lighted at a second illuminance lower than the first illuminance, characterized in that said first light source and said second light source are included in the same lighting fixture; wherein said first light source is disposed on one side of the lighting fixture that extends in the longitudinal direction thereof, being located closer to the inside of the cabin than a center line of the lighting fixture, wherein the second light source is disposed on the other side of the lighting fixture that extends in the longitudinal direction thereof, being located closer to an outside of the cabin than the center line of the lighting fixture; wherein an irradiation direction of said first light source as a main illuminant is specified to be a direction toward a center of the ceiling of the cabin, wherein an irradiation direction of said second light source as an auxiliary illuminator is specified to be a different direction from that of the first light source and toward a lower portion of a side wall of the cabin; wherein said first light source is adapted to receive an alternating current that is provided from said power supply, while said second light source is adapted to receive a direct current that is provided from said storage battery, and wherein in an emergency, when power fed from said power supply is shut off, the second light source continues to receive the direct current from said storage battery and continues to illuminate at the second illuminance, allowing passengers to identify their feet.