A nitride semiconductor light-emitting device includes a nitride semiconductor light-emitting chip including an active layer for outputting polarized light, the active layer having a non-polar plane or a semi-polar plane as a growth plane; and a light-transmissive cover for transmitting light from the active layer. The insulating housing defines a channel at a rear portion of a first side wall thereof. The shade blocks a part of light from the first light source toward the projection lens to form a low beam light distribution pattern.