A vehicle that leans into turns with an attitude leaning to the inner side of a curve and comprises a sub headlight system and a main headlight being configured to illuminate an area ahead in front of the vehicle, the sub headlight system comprising: two sub headlight units (13L, 13R) adapted to illuminate, at the same side as the side to which the vehicle is leaning, an area ahead and outward of the vehicle with respect to a width direction of the vehicle, the two sub headlight units (13L, 13R) each being provided at each side with respect to the width direction of the vehicle; a detection part adapted to detect a variable available for obtaining the lean angle of the vehicle; and a control part adapted to turn on the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) in accordance with the lean angle of the vehicle obtained based on a result of detection by the detection part, wherein the main headlight including a reflector (11 a) having an upper end edge shaped such that a central portion thereof with respect to the width direction of the vehicle protrudes upward when seen from the front side of the vehicle, characterized in that each of two sub headlight units (13L, 13R) including a plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) adapted to illuminate, at the same side as the side to which the vehicle is leaning, an area ahead and outward of the vehicle with respect to a width direction of the vehicle, the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) being arranged such that, under a state where the vehicle is upright, each of them is positioned at the side opposite to the side to which the vehicle leans for turning on the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc), and the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) being configured to be turned on in accordance with different lean angles of the vehicle when the lean angle of the vehicle increases, the sub headlight light source configured to be turned on upon a large lean angle of the vehicle being located lower and outer at the side opposite to the side to which the vehicle is leaning with respect to the width direction of the vehicle than the sub headlight light source configured to be turned on upon a small lean angle of the vehicle, wherein the two sub headlight units (13L, 13R) being arranged along the upper end edge (11 b), wherein the sub headlight light source that is located highest when the vehicle is upright is positioned above the main headlight. two sub headlight units (13L, 13R) adapted to illuminate, at the same side as the side to which the vehicle is leaning, an area ahead and outward of the vehicle with respect to a width direction of the vehicle, the two sub headlight units (13L, 13R) each being provided at each side with respect to the width direction of the vehicle; a detection part adapted to detect a variable available for obtaining the lean angle of the vehicle; and a control part adapted to turn on the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) in accordance with the lean angle of the vehicle obtained based on a result of detection by the detection part, wherein the main headlight including a reflector (11 a) having an upper end edge shaped such that a central portion thereof with respect to the width direction of the vehicle protrudes upward when seen from the front side of the vehicle, characterized in that each of two sub headlight units (13L, 13R) including a plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) adapted to illuminate, at the same side as the side to which the vehicle is leaning, an area ahead and outward of the vehicle with respect to a width direction of the vehicle, the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) being arranged such that, under a state where the vehicle is upright, each of them is positioned at the side opposite to the side to which the vehicle leans for turning on the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc), and the plurality of sub headlight light sources (13La,13Lb,13Lc,13Ra,13Rb,13Rc) being configured to be turned on in accordance with different lean angles of the vehicle when the lean angle of the vehicle increases, the sub headlight light source configured to be turned on upon a large lean angle of the vehicle being located lower and outer at the side opposite to the side to which the vehicle is leaning with respect to the width direction of the vehicle than the sub headlight light source configured to be turned on upon a small lean angle of the vehicle, wherein the two sub headlight units (13L, 13R) being arranged along the upper end edge (11 b), wherein the sub headlight light source that is located highest when the vehicle is upright is positioned above the main headlight.