EXHAUST DEVICE FOR INTERNAL COMBUSTION ENGINE

An exhaust device for an internal combustion engine mounted on a vehicle, in which a catalyst (42; 72) and a silencer (50; 80) are disposed in an exhaust pipe extending from the internal combustion engine, includes an upstream exhaust gas sensor (55; 85) disposed upstream of the catalyst (42; 72), and a downstream exhaust gas sensor (56; 86) disposed downstream of the catalyst (42; 72). The downstream exhaust gas sensor (56; 86) is mounted on an exhaust pipe (44; 74) extending outwardly from an expansion chamber (E2, E3; F1) in the silencer (50; 80). The exhaust gas sensor can easily be mounted on the exhaust pipe downstream of the catalyst without machining a case of the silencer.