Saddle-riding or straddle-type vehicle

A pipe member includes a front flange and a rear flange. The front flange is attached to a cylinder. The rear flange is attached to a throttle body. A first engagement member engages together the cylinder and the front flange. In a plan view of a vehicle, at least a portion of a throttle body is overlapped a crank case. The throttle body includes a connection portion connected to the rear flange. At least one of the connection portion and the rear flange includes a groove or channel for conducting intake air. In a side view of the vehicle, the rear flange overlaps a prolongation or extrapolation of the first engagement member extending in the axial direction of the first engagement member. As seen along the axial direction of the first engagement member, the rear flange does not overlap the first engagement member.