Air intake duct of saddle-ridden vehicle

An air intake duct of a saddle-riding type vehicle which extends rearwardly from a front portion of a vehicle body so as to pass laterally by one side of a vehicle body frame structure in a widthwise direction of the vehicle, and through which incoming wind is supplied as an intake air to a combustion engine,

• the air intake duct comprising:
• an outer half part and an inner half part divided in the widthwise direction;
• an outer side surface, a part of which is exposed to the outside in the widthwise direction, wherein:
• the air intake duct includes an upper dividing face and a lower dividing face,
• the intake air is supplied through a supercharger to the combustion engine,
• the upper dividing face is disposed inward of an intermediate position, in the widthwise direction, of the air intake duct,
• a part of an upper surface of the air intake duct is exposed to the outside,
• an inner side end portion, on an upper side, of the outer half part includes a joining portion that butts against the outer side end portion of the inner half part;
• and
• a projection is formed above the joining portion to project toward the inner side of the vehicle body beyond the joining portion;
• wherein the outer half part and the inner half part are joined to each other such that an inner side end portion of the outer half part and an outer side end portion of the inner half part butt against each other.