A vehicle headlight device capable of improving overlooking of pedestrians by a driver. The device includes: a left-side photoirradiator (left-side pattern irradiation lamp) which irradiates light on a left-side light distribution region (irradiation pattern light distribution region) on a left side of a travel roadway of a vehicle in an irradiation pattern in which a bright region a1 and a dark region are alternately repeated; and a right-side photoirradiator (right-side pattern irradiation lamp) which irradiates light on a right-side light distribution region (irradiation pattern light distribution region) on a right side of a travel roadway of the vehicle in an irradiation pattern in which a bright region a1 and a dark region are alternately repeated. In this embodiment, the left-side photoirradiator (left-side pattern irradiation lamp) is illuminated during left turn of the vehicle, and the right-side photoirradiator (right-side pattern irradiation lamp) is illuminated during right turn of the vehicle.