A vehicle lighting device is provided which improves overlooking of pedestrians by a driver even under adverse conditions such as nighttime and rainy weather. A vehicle lighting device includes: a low-beam irradiation part that illuminates a lower irradiation region ahead and below a vehicle: a pattern irradiation part that irradiates irradiation light on a lateral irradiation region on a side of the travel path of the vehicle in an irradiation pattern in which bright regions and dark regions are alternately repeated; an environmental information acquisition device which acquires information related to the moisture environment around the vehicle; and a controller which changes the irradiation mode of the low-beam irradiation part and/or pattern irradiation part based on information acquired by the environmental information acquisition device. In one mode, the controller dims irradiation light in the low-beam irradiation part, and brightens irradiation light in the pattern irradiation part when rainy weather at night.