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 (L1) 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 (L1) 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 (L1) 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 . <EOS>