HEADLIGHT DEVICE AND LEANING VEHICLE INCLUDING HEADLIGHT DEVICE

Provided is an increase in convenience of a headlight device that switches an emission area without any operation made by a rider of a leaning vehicle. A control device controls light emission from a headlight such that when an oncoming vehicle and/or a preceding vehicle is/are present in an upper left emission area while the leaning vehicle is turning in a left direction, the upper left emission area is maintained at least in its brightness as compared to when neither the oncoming vehicle nor the preceding vehicle is present in the upper left emission area while the leaning vehicle is turning in the left direction. The control device controls light emission from the headlight such that when the oncoming vehicle and/or the preceding vehicle is/are present in an upper right emission area while the leaning vehicle is turning in a right direction, the upper right emission area is maintained at least in its brightness as compared to when neither the oncoming vehicle nor the preceding vehicle is present in the upper right emission area while the leaning vehicle is turning in the right direction.