To provide a headlight enabling easy bulb replacement even when a sufficient space for bulb replacement is not secured at the rear of the headlight.

In two reflector units 16A, 16B arranged by offsetting at right and left, and back and forth, the insertion of a bulb 20B into a reflector 18Ba in the reflector unit 16B located at outside in the car width direction (namely, the reflector unit at the rear side) is done from inside in the car width direction. This enables bulb replacement effectively utilizing a dead space formed at the rear of the reflector unit 16A (inside the reflector unit 16B in the car width direction).