Headlight device and leaning vehicle

A headlight device to be employed in a leaning vehicle that, when turning left or right, leans in a direction of the turn, the headlight device comprising:

• a headlight including a plurality of light sources for respectively lighting a plurality of areas in an ahead-driving direction of the leaning vehicle, the plurality of areas including a pair of oblique area sets, which are a left oblique area set and a right oblique area set that are located in the ahead-driving direction of the leaning vehicle on the left and on the right, respectively, each of the oblique area sets including a plurality of oblique areas that are positioned at different heights in an up-down direction and that includes an uppermost oblique area, which is a highest one of the plurality of oblique areas therein, when the leaning vehicle is upright;
• and
• a control device that controls the headlight to perform bright lighting and dim lighting for the plurality of oblique areas in each of the oblique area sets, such that
• when the leaning vehicle is upright, the control device controls the lighting in each of the oblique area sets, by designating at least one of the plurality of oblique areas of said each oblique area set as in a brightly lit area, and designating the rest of the plurality of oblique areas of said each oblique area set, including the uppermost oblique area thereof, as in a dim area,
• when the leaning vehicle turns left or right, a brightly lit area as a whole in one of the oblique area sets corresponding to the direction of the turn is larger in the up-down direction than that in the other of the oblique area sets, and as a lean angle in the direction of the turn increases, the control device controls the lighting in the one of the oblique area sets corresponding to the direction of the turn, by designating a second uppermost oblique area, which is one of the plurality of oblique areas located immediately below the uppermost oblique area in the up-down direction, as in the brightly lit area, and by redesignating the uppermost oblique area, in the dim area, as in the brightly lit area, and
• the control device applies adaptive lighting control to the brightly lit area, by redesignating one or more oblique areas in the brightly lit area to be in the dim area, upon detecting an oncoming vehicle and/or a vehicle ahead in said one or more oblique areas.