A saddle riding vehicle comprising an exhaust device, wherein the vehicle comprises: a body frame ; a swing-type power unit including a cylinder and a cylinder head which are arranged with a cylinder axis (C) inclined frontward in an approximately horizontal direction and are mounted on a crankcase , the swing-type power unit being swingably supported on the body frame by way of a link member ; an exhaust pipe connected to the cylinder head ; a catalyst device provided in the exhaust pipe in such a manner that the exhaust pipe is connected to both ends of the catalyst device in a longitudinal direction of the catalyst device ; the body frame has a foot placing portion positioned in front of the swing-type power unit ; the catalyst device is arranged such that at least a part of the catalyst device is disposed below the cylinder as viewed in a side view of the vehicle, and an undercover is arranged below the foot placing portion and in front of the catalyst device , characterized in that : the longitudinal direction of the catalyst device is directed in a width direction of the vehicle ; the undercover has a bottom surface formed thereon with an upright air guide rib extending in the longitudinal direction of the vehicle; the air guide rib has a rear end directed toward the catalyst device as viewed in a plan view; and a bottom surface rear end of the bottom surface is directed toward the catalyst device . a body frame ; a swing-type power unit including a cylinder and a cylinder head which are arranged with a cylinder axis (C) inclined frontward in an approximately horizontal direction and are mounted on a crankcase , the swing-type power unit being swingably supported on the body frame by way of a link member ; an exhaust pipe connected to the cylinder head ; a catalyst device provided in the exhaust pipe in such a manner that the exhaust pipe is connected to both ends of the catalyst device in a longitudinal direction of the catalyst device ; the body frame has a foot placing portion positioned in front of the swing-type power unit ; the catalyst device is arranged such that at least a part of the catalyst device is disposed below the cylinder as viewed in a side view of the vehicle, and an undercover is arranged below the foot placing portion and in front of the catalyst device , characterized in that : the longitudinal direction of the catalyst device is directed in a width direction of the vehicle ; the undercover has a bottom surface formed thereon with an upright air guide rib extending in the longitudinal direction of the vehicle; the air guide rib has a rear end directed toward the catalyst device as viewed in a plan view; and a bottom surface rear end of the bottom surface is directed toward the catalyst device . the longitudinal direction of the catalyst device is directed in a width direction of the vehicle ; the undercover has a bottom surface formed thereon with an upright air guide rib extending in the longitudinal direction of the vehicle; the air guide rib has a rear end directed toward the catalyst device as viewed in a plan view; and a bottom surface rear end of the bottom surface is directed toward the catalyst device . <EOS>