A saddle-riding or straddle-type vehicle, comprising: an engine including a cylinder and a crank case connected to a lower portion of the cylinder and extending rearward; a throttle body disposed rearward of the cylinder and being configured to adjust a flow rate of intake air supplied into the engine; a pipe member including a front flange attached to the cylinder and a rear flange attached to the throttle body, the pipe member connecting the cylinder and the throttle body; and a first engagement member engaging together the cylinder and the front flange, wherein: in a plan view of the vehicle, at least a portion of the throttle body overlaps the crank case; the throttle body includes a connection portion connected to the rear flange; at least one of the connection portion of the throttle body and the rear flange includes a groove for supplying intake air; in a side view of the vehicle, the rear flange overlaps a prolongation or extrapolation of the first engagement member extending in an axial direction of the first engagement member; and when viewed along the axial direction of the first engagement member, the rear flange does not overlap the first engagement member, wherein the groove constitutes an auxiliary flow conduit; and the auxiliary flow conduit bypasses from an upstream side of a valve body to a downstream side of the valve body. an engine including a cylinder and a crank case connected to a lower portion of the cylinder and extending rearward; a throttle body disposed rearward of the cylinder and being configured to adjust a flow rate of intake air supplied into the engine; a pipe member including a front flange attached to the cylinder and a rear flange attached to the throttle body, the pipe member connecting the cylinder and the throttle body; and a first engagement member engaging together the cylinder and the front flange, wherein: in a plan view of the vehicle, at least a portion of the throttle body overlaps the crank case; the throttle body includes a connection portion connected to the rear flange; at least one of the connection portion of the throttle body and the rear flange includes a groove for supplying intake air; in a side view of the vehicle, the rear flange overlaps a prolongation or extrapolation of the first engagement member extending in an axial direction of the first engagement member; and when viewed along the axial direction of the first engagement member, the rear flange does not overlap the first engagement member, wherein the groove constitutes an auxiliary flow conduit; and the auxiliary flow conduit bypasses from an upstream side of a valve body to a downstream side of the valve body. in a plan view of the vehicle, at least a portion of the throttle body overlaps the crank case; the throttle body includes a connection portion connected to the rear flange; at least one of the connection portion of the throttle body and the rear flange includes a groove for supplying intake air; in a side view of the vehicle, the rear flange overlaps a prolongation or extrapolation of the first engagement member extending in an axial direction of the first engagement member; and when viewed along the axial direction of the first engagement member, the rear flange does not overlap the first engagement member, wherein the groove constitutes an auxiliary flow conduit; and the auxiliary flow conduit bypasses from an upstream side of a valve body to a downstream side of the valve body.