To improve a cooling performance of an exhaust gas sensor by a cooling device of the vehicle exhaust gas sensor aggressively cooling the exhaust gas sensor.

An exhaust gas sensor (26) is arranged in an assembly part (23) of an discharging manifold (20) so as to outwardly protrude from a discharging manifold cover (25), and an opening part (33) from which running wind is introduced into an engine room (6) is provided to a perpendicularly lower side of the arrange position of the exhaust gas sensor (26). A hat shaped cross-section guide member (35) for guiding the running wind introduced from the opening part (33) to the exhaust gas sensor (26) is attached to the discharging manifold cover (25).