Lighting tool for vehicle and vehicle rearward illumination system

A lighting tool for a vehicle comprising:

• a first light emission unit that includes a first light source and a reflector, and that is configured to reflect first light emitted from the first light source using the reflector and emit the first light reflected by the reflector rearward from a vehicle;
• and
• a second light emission unit that includes a second light source and a light guide lens, and that is configured to guide second light emitted from the second light source using the light guide lens and emit the second light guided by the light guide lens rearward from the vehicle,
• wherein any one of light emission unit of the first light emission unit and the second light emission unit illuminates an illumination range behind the vehicle with any one of the first light and the second light, and
• other one of the light emission unit of the first light emission unit and the second light emission unit is disposed in plural in a vehicle width direction and selectively illuminates illumination regions, which are divided in the vehicle width direction so as to overlap the illumination range, with the other light of the first light and the second light.